Information on using our ticket system

Due to the current situation, most of our IT group is located in the home office. If you have a request or a question, please use our ticket system. We ask you not to recycle an old ticket, because this way the ticket is not recognized as a new but as an old ticket and will appear at the bottom of our system and might be overlooked. You can also leave out the "thank you" mail after we solved the problem, because this will open the ticket again and we have to close it a second time.

Call phone numbers with Skype for Business Mobile

Using the app

To make calls to a phone number from the Skype for Business App, all you have to do is click on the dialpad icon in the upper right corner.

Then you can dial the number.

ATTENTION: There must be a 0 in front of the desired number, otherwise the call will not be forwarded.

This guide works for both IPhone and Android devices.

You can find more information on the ZDV website (German).

Create ssh-tunnel to kph infrastructure

Manual on how to create a ssh-tunnel to kph infrastructure.

For this you will need an KPH-Account and access via SSH has to be activated by us.

If you already have an KPH-Account, write an E-Mail with your KPH username to and ask to be enabled for SSH. Please attach your public SSH-key to the E-Mail.

After we enabled your account, you can create a ssh-tunnel with Linux (batch, etc.) or Windows 10 (cmd, etc.) as follows:

ssh -N -L <local-port>:<kph-pcname>:<kph-port>

  • <kph-pcname>  = Name of your computer in the institute. e.g.
  • <kph-port> =  Port number of your computer within the KPH. e.g. RDP 3389
  • <local-port> = any port number > 1000. You access this locally. e.g. 12345

Now you can establish a connection on your local computer to the KPH computer using the <local-port>. e.g. by putting localhost:12345 as RDP-Client destination.

Simply terminate the tunnel at the end of the session.

Older versions of windows:

Alternatively for older versions of windows your can use the program PuTTY. Please follow the instructions for Generating a SSH key with PuTTY.

Posted on | Posted in Allgemein

Create ssh-key pairs

Update: May 15, 2020 - Due to a serious security incident on the university's HPC systems, all SSH keys used so far lose their validity with immediate effect.

If you need access to the computer network of the Institute of Nuclear Physics, please generate a *new* SSH key pair. Use a particularly good passphrase, your email address (Uni-Mainz or home institute) as comment.

Under no circumstances should you omit the passphrase. As you can see, one single careless person is enough to cause inconvenience to the whole university. Do not be that person!

If possible, create an ed25519 key:


ssh-keygen -t ed25519


Two files are created:

  • Your public key ~/.ssh/ should be sent to, with the request to add you to the ssh gateway.
  • Your private key ~/.ssh/id_ed25519 will be activated with your passphrase. Passphrase and private key are to be kept secret and must not be given to anyone - not even to us.

Alternatively, you can also generate rsa keys. However, this is only useful if you need access to older systems. The key length should be at least 3072 bits, but not more than 4096 bits. It does not make sense to increase the rsa key length further. The gain in security is minimal, the handling is very difficult and the algorithm becomes even slower. If you have security concerns, use the ed25519 keys.

If you yourself have access to a machine for which you want to set up remote access, you can also add the public key yourself to the ~/.ssh/authorized_keys file.

Alternative for older Windows versions:

Please follow our instructions for generating SSH keys with PuTTY.