SEH myUTN User manual

myUTN
USB Deviceserver
User Manual
Linux
utnserver Pro

USB Deviceserver User Manual Linux
Manufacturer & Contact
Document
Type: User Manual
Title: USB Deviceserver User Manual Linux
Version: 1.2 | 2021-12
Legal Information
SEH Computertechnik GmbH has endeavored to ensure that the information in this documentation is correct. If
you detect any inaccuracies please inform us at the address indicated above. SEH Computertechnik GmbH will not
accept any liability for any error or omission. The information in this manual is subject to change without notifi-
cation.
The original manual is the German version of this document and shall govern. All non-German versions of this
document are translation of the original manual.
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Computertechnik GmbH is prohibited.
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SEH Computertechnik GmbH
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Germany
Phone: [phone]
Fax: [phone]
Support: [phone]
Email: inf[email protected]
Web: https://www.seh-technology.com

USB Deviceserver User Manual Linux
Content
1 General Information........................................................................................ 1
1.1 Product ..............................................................................................................................................................................................2
1.2 Documentation ..............................................................................................................................................................................3
1.3 Support and Service......................................................................................................................................................................5
1.4 Your Safety .......................................................................................................................................................................................6
1.5 First Steps .........................................................................................................................................................................................7
2 Administration Methods................................................................................. 8
2.1 Administration using the utnserver Control Center .........................................................................................................9
2.2 Administration via the SEH UTN Manager......................................................................................................................... 11
2.3 Administration via Email .......................................................................................................................................................... 17
3 Network Settings ........................................................................................... 19
3.1 How to Configure IPv4 Parameters...................................................................................................................................... 20
3.2 How to Configure IPv6 Parameters...................................................................................................................................... 22
3.3 How to Use the UTN Server in VLAN Environments....................................................................................................... 23
3.4 How to Configure the DNS...................................................................................................................................................... 25
3.5 How to Configure Email (POP3 and SMTP)........................................................................................................................ 26
3.6 How to Configure Bonjour ...................................................................................................................................................... 28
4 Device Settings .............................................................................................. 29
4.1 How to Assign a Description................................................................................................................................................... 30
4.2 How to Configure the Device Time...................................................................................................................................... 31
4.3 How to Configure the (Encrypted) UTN Port .................................................................................................................... 32
4.4 How to Assign a Name to a USB Port................................................................................................................................... 33
4.5 How to Write a Description for a USB port ........................................................................................................................ 34
4.6 How to Get Messages................................................................................................................................................................ 35
5 Working with the SEH UTN Manager ........................................................... 37
5.1 How to Find UTN Servers/USB Devices in the Network................................................................................................ 38
5.2 How to Establish a Connection to a USB Device ............................................................................................................. 40
5.3 How to End the Connection between the USB Device and the Client.................................................................... 41
5.4 How to Request an Occupied USB Device......................................................................................................................... 42
5.5 How to Automate USB Device Connections and Program Starts ............................................................................. 43
5.6 How to Find Status Information on USB Ports and USB Devices............................................................................... 45
5.7 How to Use the Selection List and Manage User Access Rights with It................................................................... 47
5.8 How to Use the SEH UTN Manager without Graphical User Interface (utnm)...................................................... 50
6 Security........................................................................................................... 55
6.1 How to Define the Encryption Strength for SSL/TLS Connections........................................................................... 56
6.2 How to Encrypt the USB Connection................................................................................................................................... 58
6.3 How to Encrypt the Connection to the utnserver Control Center............................................................................ 60
6.4 How to Protect Access to the utnserver Control Center
(User Accounts)61
6.5 How to Block UTN Server Ports (TCP Port Access Control).......................................................................................... 62
6.6 How to Control Access to USB Devices............................................................................................................................... 63
6.7 How to Block USB Device Types............................................................................................................................................ 66
6.8 How to Use Certificates ............................................................................................................................................................ 67

USB Deviceserver User Manual Linux
6.9 How to Configure Network Authentication (IEEE 802.1X)........................................................................................... 72
6.10 How to Configure SNMP .......................................................................................................................................................... 75
6.11 How to Disable a USB Port....................................................................................................................................................... 76
7 Maintenance .................................................................................................. 77
7.1 How to Backup Your Configuration..................................................................................................................................... 78
7.2 How to Reset Parameters to their Default Values........................................................................................................... 80
7.3 How to Perform a Device Software Update ...................................................................................................................... 81
7.4 How to Restart the UTN Server .............................................................................................................................................. 82
8 Appendix ........................................................................................................ 83
8.1 Glossary .......................................................................................................................................................................................... 84
8.2 Troubleshooting ......................................................................................................................................................................... 85
8.3 Parameter lists.............................................................................................................................................................................. 87
8.4 SEH UTN Manager – Feature Overview.............................................................................................................................108

1
USB Deviceserver User Manual Linux General Information
1 General Information
• Product  2
• Documentation  3
• Support and Service  5
• Your Safety  6
• First Steps  7

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USB Deviceserver User Manual Linux General Information
1.1 Product
Purpose
UTN servers comprise USB Deviceservers and USB Dongleservers. As USB Deviceservers, they make non-network-
ready USB devices (e.g. USB hard disk drives, USB printers, etc.) accessible via TCP/IP network. For this purpose, the
USB devices will be connected to the USB ports of the UTN server. Then the UTN (UTN = USB to Network) func-
tionality and the corresponding software tool 'SEH UTN Manager' establish a virtual USB connection between USB
device and client. The USB device can be used as if it were connected locally.
System Requirements
The UTN server has been designed for use in TCP/IP networks.
The SEH UTN Manager can be used in the following systems:
• Microsoft Windows (32/64-Bit; Windows 10, Windows 11 , Server 2012 R2, 2016, 2019, 2022)
• macOS 10.15 (Catalina), macOS 11 (Big Sur)1, macOS 12 (Monterey)2
• Linux (Ubuntu 18.04/20.0.4, Debian 9/10/11, CentOS 7/8, CentOS Stream 8, Oracle 7/8, RHEL 7.4/8.4, Open-
SUSE Leap 15.3, SUSE Linux Enterprise Server 15) 3
• IPv4 TCP/IP network
• IPv6 TCP/IP network
This document describes usage under Linux environments. Information about the usage in other environments
can be found in the relevant system-specific User Manual. More details can be found in chapter ’Documentation’
 4.
1. macOS 11.x (Big Sur) only limited USB device support not running on Apple Silicon (Apple M1 chip) based Macs
2. macOS 12.x (Monterey) only limited USB device support not running on Apple Silicon (Apple M1 chip) based
Macs
3. A successful installation cannot be guaranteed due to the variety of Linux systems! The installation must be car-
ried out under your own responsibility.

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USB Deviceserver User Manual Linux General Information
1.2 Documentation
Please load all current documents from our Website:
https://www.seh-technology.com/de/service/downloads.html
Further applicable documents
The USB Deviceserver documentation consists of the following documents:
Quick Installation Guide Print, PDF Information on safety, technical data, declarations of con-
formity and description of the hardware installation and
initial setup.
User Manual PDF Detailed description of the UTN server configuration,
administration and maintenance. System-specific instruc-
tions for the following systems:
- Windows
- macOS
- Linux
Online help HTML Information on how to use the 'utnserver Control Center'
web interface.
(Embedded into web interface; no download.)
Product information Print, PDF Features and technical data
Brochures Print, PDF http://www.seh-technology.com
Open source licenses online https://www.seh-technology.com/services/licenses.html

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USB Deviceserver User Manual Linux General Information
Symbols and Legend
A variety of symbols and mark-ups are used within this document.
WARNING
Warning A warning contains important information that must be heeded. Non-
observance may lead to malfunctions.
Important:
Important information These notes contain crucial information for failure-free operation.
Requirement Requirements that must be met before you can begin the action.
• Numeration Listing
1. Numeration Step-by-step instructions
Result Outcome of a performed action
Tip Recommendations and beneficial advice
 Reference (Within the document you can use hyperlinks.)
Bold Established terms (e.g. of buttons, menu items, or selection lists)
Courier Code (e.g. for command lines or scripts), Paths
'Proper names' Single quotation marks identify proper names

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USB Deviceserver User Manual Linux General Information
1.3 Support and Service
SEH Computertechnik GmbH offers extensive Support. If you have any questions, please contact us.
Customers from the United States of America (USA) and Canada please contact North American Support:
All information and downloads regarding your product are available on our website:
Monday through Thursday
Friday
8:00 a.m. to 4:45 p.m.
8:00 a.m. to 15:15 p.m.
[phone]
[e-mail]
Monday – Friday 9:00 am – 5:00 pm (EST/EDT)
[phone]
[e-mail]
https://www.seh-technology.com

6
USB Deviceserver User Manual Linux General Information
1.4 Your Safety
Read and observe all safety regulations and warnings found in the documentation, on the device and on the pack-
aging. This will avoid potential misuse and prevent damages to people and devices.
Intended Use
The UTN server is used in TCP/IP networks and has been designed for use in office environments. It allows multiple
network users to access non-network-ready USB devices.
Improper Use
All uses of the device that do not comply with the functionalities described in the USB Deviceserver documenta-
tion are regarded as improper use.
Safety Regulations
Before starting the initial setup of the UTN server, read and observe the safety regulations in the 'Quick Installation
Guide'. This document is enclosed in the packaging in printed form.
Warnings
Read and observe all warnings mentioned in this document. Warnings are found before any instructions known
to be dangerous. They are presented as follows:
Liability and Guarantee
SEH Computertechnik GmbH will not accept any liability for personal injuries, property damages and consequen-
tial damages resulting from the non-observance of the mentioned safety regulations and warnings. Non-obser-
vance will also result in any guarantee claims becoming void.
Modifications to the Device and Repairs
It is not allowed to make modifications to the hardware and software or to try to repair the device. If your device
needs to be repaired, contact our support  5.
WARNING
Warning!

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USB Deviceserver User Manual Linux General Information
1.5 First Steps
1. Read and observe the security regulations in order to avoid damages to people and devices  6.
2. Install the hardware. Hardware installation includes connecting the UTN server to the network, USB devices,
and power grid   ‘Quick Installation Guide’.
3. Install the software. Software installation includes installing the required 'SEH UTN Manager' software tool on
your client and assigning an IP address   ‘Quick Installation Guide’.
4. Configure the UTN server so that it is optimally embedded it into your network and sufficiently protected. All
information on how to do this you will find in this document.
5. Use the SEH UTN Manager to establish and manage connections to the USB devices which are connected to
the UTN server   ’Working with the SEH UTN Manager’  37.
You can find information on the USB Deviceserver documentation in the chap-
ter’Documentation’  3.

8
USB Deviceserver User Manual Linux Administration Methods
2 Administration Methods
You can administer, configure and maintain the UTN server in a number of ways:
• Administration using the utnserver Control Center  9
• Administration via the SEH UTN Manager  11
• Administration via Email  17

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USB Deviceserver User Manual Linux Administration Methods
2.1 Administration using the utnserver Control Center
The UTN server has a user interface, the utnserver Control Center, which can be opened using an Internet
browser (e.g. Mozilla Firefox).
The UTN server can be configured, monitored and maintained using the utnserver Control Center.
• Opening utnserver Control Center in the Browser  9
• Opening utnserver Control Center from SEH UTN Manager  9
• Controls  10
Opening utnserver Control Center in the Browser
The UTN server is connected to the network and the power grid.
The UTN server has a valid IP address  20.
1. Open your browser.
2. Enter the IP address of the UTN server as the URL.
The utnserver Control Center will be displayed in the browser.
Opening utnserver Control Center from SEH UTN Manager
The UTN server is connected to the network and the power grid.
The UTN server has a valid IP address  20.
The SEH UTN Manager is installed on the client  11.
1. Start the SEH UTN Manager.
2. In the selection list, select the UTN server.
3. In the menu bar, select UTN Server – Configure.
Your browser opens and the utnserver Control Center is displayed.
Important:
If the utnserver Control Center is not displayed, check if a gateway is
configured ( 20) and the proxy settings of your browser.
Important:
With RHEL and Oracle 8, opening the utnserver Control Center only works when
the firewall is disabled or with a suitable firewall configuration.
The following ports must be enabled for this purpose:
• UDP port 427 (SLP multicast)
• TCP/IP port 9300 and 9301 (internal communication between SEH UTN Manag-
er and SEH UTN Service)
• TCP/IP port 9310 (device request in the SEH UTN Manager)
• TCP/IP-Port 9200/9443 (data transfer between the SEH UTN Manager and the
UTN server)
Please also refer to the documentation of Oracle:
https://docs.oracle.com/en/operating-systems/oracle-linux/8/firewall/F20786.pdf
All adjustments to the firewall must be made on your own responsibility.

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USB Deviceserver User Manual Linux Administration Methods
Controls
Figure 2.1-1: utnserver Control Center
1 Product & Company Manufacturer’s contact details and additional product information.
2 Menu item After selecting a menu item, the available submenu items are displayed.
3 Page Menu content
4 Globe Language selection
5 ? icon Online help
54
3
1
2

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USB Deviceserver User Manual Linux Administration Methods
2.2 Administration via the SEH UTN Manager
The 'SEH UTN Manager' is a software tool developed by SEH Computertechnik GmbH. The SEH UTN Manager is
used to establish and manage connections to the USB devices connected to the UTN servers.
• Features  11
• Versions  12
• Installation  13
• Program Start  16
Features
The software is installed on all clients that are meant to access a USB device in the network. After the SEH UTN
Manager is started, the network is scanned for connected UTN servers. All UTN servers found and their connected
USB devices are displayed in the 'network list'. To use the USB devices connected to the UTN server, you have to
add the UTN server to the 'selection list'. The devices shown in the selection list can be administrated and the con-
nected USB devices can be used. Working working with the SEH UTN Manager is described in detail in the chapter
’Working with the SEH UTN Manager’  37.
Figure 2.2-1: SEH UTN Manager
Important:
The SEH UTN Manager can be used in IPv4 and IPv6 environments. The selection
determines which IP version is used in the software.
"IPv4" is default. Selecting "IPv6" is only suitable for IPv6 networks. If you are not
sure about your network, select "IPv4 and IPv6".
4 5
1
3
2

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USB Deviceserver User Manual Linux Administration Methods
Detailed information on how to use the SEH UTN Manager can be found in the   'SEH UTN Manager Online
Help'. To start the online help, go to the SEH UTN Manager menu bar and select Help – Online Help.
Versions
The SEH UTN Manager is available in two versions:
• Complete Version:
SEH UTN Manager with graphical user interface (figure 2.2-1 11) and additional features.
• Minimal version (without graphical user interface):
Usage only via command line ('utnm'  50) .
In both versions the 'SEH UTN Service' (Daemon) works in the background and is automatically active after the
system start.
Additionally, the following user groups are distinguished:
• users with administrative rights (administrator)
• users without administrative rights (standard user)
1 Menu bar Available menu items
2 Buttons for editing the selec-
tion list
Opens the dialog for searching UTN servers in the network and for select-
ing the desired devices  38.
3 Buttons for managing the
port connection
Establishes a connection to the USB device connected to the USB port (
40) or interrupts the connection ( 41).
4 Selection list Shows the selected UTN servers and the connected USB devices.
5 Display area for the proper-
ties
Shows information on the selected UTN server or USB device  45.
Important:
Some SEH UTN Manager features might not be displayed or are displayed as inac-
tive. This depends on
• the type and location of the selection list
• the user's rights and the group memberships on the client
• the client operating system
• the settings of the product-specific security mechanisms
• the status of the UTN server and respective USB port
More details can be found in chapter ’SEH UTN Manager – Feature Overview’ 
108.
Important:
The complete version is recommended for general use.
The minimal version is to be used by experts only!
Important:
Some features can only be configured by administrators. More details can be
found in chapter ’SEH UTN Manager – Feature Overview’  108.

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USB Deviceserver User Manual Linux Administration Methods
Installation
In order to use the SEH UTN Manager, the program must be installed on a computer with a Linux operating sys-
tem. The SEH UTN Manager installation file can be found on the SEH Computertechnik GmbH website:
https://www.seh-technology.com/services/downloads.html
The following installation packages are available for Linux systems (64-bit):
• *.deb (for 64-bit Debian-based systems)
• *.rpm (for 64 bit Red Hat-based systems)
The installation was successfully tested in the following 64-bit systems:
• Debian: Debian 10/11, Ubuntu 18.04/20.0.4
• Red Hat: Red Hat Enterprise Linux 7.4/8.4, Oracle 8, CentOS 7/8, CentOS Stream 8, SUSE Enterprise Linux
Stream 15, OpenSUSE Leap 15.3
Installation requirements:
deb: Linux kernel 2.6.32 or higher, glibc 2.15 or higher, DKMS (Dynamic Kernel Module Support)
rpm: Linux kernel 2.6.32 or higher, glibc 2.12 or higher, DKMS (Dynamic Kernel Module Support)
There are four installation packages:
1) driver
2) service (SEH UTN service/daemon)
3) clitool (command line interface tool 'utnm')
4) manager (graphical user interface)
The number of installed packages determines the version of the SEH UTN Manager:
package 1)-3): minimal version
package 1)–4): complete version
The installation of the files depends on the distribution. For more information, refer to the documentation of your
operating system.
WARNING
A successful installation cannot be guaranteed due to the multitude of Linux vari-
eties!
The installation must be carried out on your own.
SEH Computertechnik GmbH provides installation support upon request for a fee
 5.
Important:
Install the packages in the order given above to comply with their dependencies.
Important:
Installation must only be carried out by experienced users.

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USB Deviceserver User Manual Linux Administration Methods
Some installation examples are given below.
• ’Installing the SEH UTN Manager in Ubuntu 20.0.4 (64-Bit) via Software Management’  14
• ’Installing the SEH UTN Manager in Ubuntu 20.0.4 (64-Bit) via Terminal’  14
• ’Installing the SEH UTN Manager in Red Hat Enterprise Linux Server (8)’  15
Installing the SEH UTN Manager in Ubuntu 20.0.4 (64-Bit) via Software Management
Linux kernel 2.6.32 or later
glibc 2.15 or later
OpenSSL 1.0.1 or later
DKMS (Dynamic Kernel Module Support) is installed on the client.
The user used can gain root privileges via the command sudo.
1. Start installation package no. 1.
The Ubuntu Software appears.
2. Click Install.
A password prompt appears.
3. Authenticate yourself with your password.
The package will be installed on your client.
4. Repeat steps 1 through 3 with the remaining packages.
5. Add all users that are to administrate the SEH UTN Manager on the client to the user group 'utnusers'. To do
this, open a Terminal and enter the command:
sudo usermod -aG utnusers <username>
6. Logout and login again so that the group changes take effect.
The SEH UTN Manager is installed on your client. Check the installation by starting the SEH UTN Manager (
16) and activating a connection to the USB port including the connected USB device. All information on this
can be found in chapter ’Working with the SEH UTN Manager’  37.
Installing the SEH UTN Manager in Ubuntu 20.0.4 (64-Bit) via Terminal
Linux kernel 2.6.32 or later
glibc 2.15 or later
OpenSSL 1.0.1 or later
DKMS (Dynamic Kernel Module Support) is installed on the client.
The user used can gain root privileges via the command sudo.
1. Open a Terminal.
2. Install the headers for your kernel:
sudo apt-get install linux-headers-`uname -r`
Important:
Knowledge Base articles with further installation information for Linux (e.g. instal-
lation of DKMS and the UEFI Secure Boot problem) are available at the SEH Com-
putertechnik GmbH website:
https://www.seh-technology.com/services/knowledgebase.html

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USB Deviceserver User Manual Linux Administration Methods
3. Verify, that the version numbers of kernel and headers match exactly:
Kernel: uname -r
Header: sudo apt list --installed | grep linux-headers
4. Change to the directory containing the SEH UTN Manager packages:
cd <directory>
5. Install the desired SEH UTN Manager packages:
sudo dpkg -i <full package name>
6. Add all users that are to administrate the SEH UTN Manager on the client to the user group 'utnusers'. To do
this, open a Terminal and enter the command:
sudo usermod -aG utnusers <username>
7. Logout and login again so that the group changes take effect.
The SEH UTN Manager is installed on your client. Check the installation by starting the SEH UTN Manager (
16) and activating a connection to the USB port including the connected USB device. All information on this
can be found in chapter ’Working with the SEH UTN Manager’  37.
Installing the SEH UTN Manager in Red Hat Enterprise Linux Server (8)
Linux kernel 2.6.32 or later
glibc 2.12 or later
OpenSSL 1.0.1 or later
DKMS (Dynamic Kernel Module Support) is installed on the client.
The user used can gain root privileges via the command sudo.
1. Open a Terminal.
2. Install the headers for your kernel:
sudo yum install kernel-devel-`uname -r`
3. Verify, that the version numbers of kernel and headers match exactly:
Kernel: uname -r
Header: sudo yum list | grep kernel-headers
4. Change to the directory containing the SEH UTN Manager packages:
cd <directory>
5. Install the desired SEH UTN Manager packages:
sudo yum install <full package name>
6. Add all users that are to administrate the SEH UTN Manager on the client to the user group 'utnusers'. To do
this, open a Terminal and enter the command:
sudo usermod -aG utnusers <username>
7. Logout and login again so that the group changes take effect.
The SEH UTN Manager is installed on your client. Check the installation by starting the SEH UTN Manager (
16) and activating a connection to the USB port including the connected USB device. All information on this
can be found in chapter ’Working with the SEH UTN Manager’  37.
WARNING
The version numbers must be identical. Otherwise, the SEH UTN Manager pack-
ages cannot be installed correctly.
If kernel and headers do not match, you must create a match on your own.
WARNING
The version numbers must be identical. Otherwise, the SEH UTN Manager pack-
ages cannot be installed.
If kernel and headers do not match, you must create a match on your own.

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USB Deviceserver User Manual Linux Administration Methods
Program Start
To start the SEH UTN Manager, go to the launcher and call 'UTN Manager' via Dash (search) or go to Terminal an
run the command utnmanager.
Update
You can check for program updated manually and automatically. More information can be found in the  'SEH
UTN Manager Online Help'.