Regional University Computing Center

FAQ - Frequently asked questions

In this page you will find the answers to the most frequently asked questions.


At the moment we are working on a full translation for this page. We ask for your patience.

VPN – Your connection from your home to the TUK

By using the VPN access point of the TUK your client will get an ip-address of the TUK network. You will actually become a member of the TUK network and you can use all the services the TUK offers, even if you are not on the campus. The entire communication and data-exchange between your device like personal computer, laptop, tablet computers or smartphone and the TUK network will be tunneled through a secure and encryted connection.

The Staff gets the opportunity to use a feature called Full Tunnel. Full Tunnel means, that the entire data exchange is being encrypted before the TUK network can be reached. In this way a secure connection can be  established while using hotspots or third party providers.

You will find detailled instructions for setting a VPN connection on our webpage at VPN-Einrichtung.

When ever you are asked for an authorization, for example WLAN, VPN or 801.1X your username followed by and your password is needed. In the past a Unix/AIX/Linux and a Windows password was required. This is obsolete now. In case you did not have a chance to synchronize your passwords at you should do it as soon as possible. The section RHRK account  is glad to provide additional information for you.

All the holders of a valid RHRK-Account are considered to be authorized users. External users may use the profile Split Tunnel only. Role accounts and accounts of student organizations are not authorized. Further information can be found in the RHRK account section.

You do see a context menu with the entries "group" or "Gruppe" in your VPN login dialog to choose the VPN profile.

Option 1 is Full Tunnel. That means, that all data transferred is using the VPN gateway. There are two main reasons to select this profile. You are getting a TUK IP address and all data is transferred encoded even if you are using a public hotspot.
This option is restricted to TUK members.

In case of Split Tunnel only the traffic towards the TU Kaiserslautern is routed through the encrypted tunnel. If your home-provider is considered save for confidential communication and you need to access services restricted to the TUK network, you may use this profile.
For external users, this is the only option.

The option "Full Tunnel (with) local LAN access" is pretty much like "Full Tunnel" plus access to your local network (to use your printer or NAS for instance), what in case of standard Full Tunnel is blocked for security reasons. Do not choose this profile while connected to an untrusted network or a public hotspot.
This option is restricted to TUK members.

Your VPN client is saving your selection as a preferred option.

Only endpoint devices like your desktop computer, laptop, tablet or smartphone are meant to use the Remote Access VPN, home routers are not.

No. Since the TUK dorms have a physical connection with the TUK network, there is no need for a VPN connection.

There a maximum of 3 parallel VPN connections per account possible.

If you are located outside the TUK network and established a VPN connection using the "Full Tunnel" option you may check your own IP.
Just go to or
You should get something like in case of ipv4 or 2001:638:208:xxx: in case of ipv6. These numbers are reserved for the TUK and indicate that you established the connection successfully.

In general, yes it is possible.
Some companies are using a proxy server which has to be used to access the internet. The VPN client by default uses the proxy server setup in the operating system, so in most cases the VPN connection can still be established. (Check the proxy details in your network connection settings.)

A VPN connection needs at least a TCP port 443 to If there is good network connectivity it may be possible to use UDP port 443 to optimize the speed.

In this case you have to select the the option "Split_Tunnel" or "Full_Tunnel-Local_LAN_Access" in the groups(Gruppe)-menu within the login dialog.

Since you are located on the campus and already logged in the TUK network it is not feasible to use a VPN connection.

Most likely you are using the wrong combination of username and password or just a typing mistake. In addition you need to check if you are an authorized user and/or have a valid account.
May be your passwords for the different RHRK services are not synchronised properly. To rule this out go to and reset your password.

A reinstall is not necessary if you have the Cisco AnyConnect Secure Mobility Client installed.
However you have to select on your first login. On your first login the TUK profile will be installed automatically and saved as TU Kaiserslautern. The next time you want to connect just chose this entry to connect.

Please be aware, that your VPN client may be updated automatically once you log in.

Cisco provides the following information: "AnyConnect for Android is available for download only from the Android Market for your Android device, or from Amazon for Kindle devices. You cannot download it from the Cisco website or after connecting to a secure gateway."

If our FAQ and configuration notes could not help you, you can seek advice from our Service Point.

In addition you can get support by writing a detailed email to hotline(at) Please make
sure you specify the operating system in use. If possible submit the log files of your VPN client. (If
your are using windows, this should be found at C:\Program Files (x86)\OpenVPN\log.)



You have to open VMware VSphere client and select VM. With the right mouse-button you can open a context menu. You have to select Gastbetriebssystem → VMware aktualisieren. As soon this is done a CD containing the Guest-Tools software will appear in the VM.

Linux (RPM):

You have to open VMware Vsphere client and select VM. With the right mouse-button you can open a context menu. You have to select Gastbetriebssystem → VMware aktualisieren. As soon this is done a CD containing the Guest-Tools software will appear in the VM.

Linux (APT):

apt-get install open-vm-tools

To avoid problems with IO-timeouts in the VM you have to edit the OP-Operations of your operating System.


You have to add the appropriate Timeouts in the windows registry. Just download windows_gos_timeout.reg and execute it. As soon as you restart the VM, the changes will be applied and can be used.


Using Linux you can edit the Timeouts using udev. You have to go to etc/udev/rules.d/ and add a new rule called  99-vmware-scsi-udev.rules . Once its done you have to execute the command udevcontrol reload_rules to start the new rules.


IO scheduling is handled by the ESX-hosts. So the VM itself can be run with a low level scheduling. The noop-scheduling system of the Kernel will be sufficient.


You have to edit /etc/default/grub by adding or modifying the following line:



RedHat derivatives:

For RedHat and distributions based on RedHat you do the following:

grubby --update-kernel=ALL --args="elevator=noop"

After you reboot your system, the modifications get applied and will be active.

Kernel parameters:


In /etc/sysctl.d/ you have to generate a esx.conf file.

RedHat derivatives:

You have to add the following lines in your /etc/sysctl.conf:


# Reboot 5 seconds after panic 
kernel.panic = 5

# Panic if a hung task was found
kernel.hung_task_panic = 1

# Setup timeout for hung task to 300 seconds 
kernel.hung_task_timeout_secs = 300

#Use less memory for FS-Buffer

The changes, modifications will be activated once you execute a sysctl -p.

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