Debugging Connection Problems¶
When you encounter problems with the login to the cluster although we indicated that you should have access, depending on the issue, here is a list of how to solve the problem:
I'm getting a "connection refused"¶
The full error message looks as follows:
ssh: connect to host hpc-login-1.cubi.bihealth.org port 22: Connection refused
This means that your computer could not open a network connection to the server.
- HPC 4 Clinic is currently only available from the Charite (cabled) network.
- HPC 4 Research can be connected to from:
- Charite (cabled) network
- Charite VPN but only with Zusatzantrag B.
- MDC (cabled) network
- MDC VPN
- BIH (cabled) network
- If you think that there is no problem with any of this then please include the output of the following command in your ticket (use the server that you want to read instead of
ifconfig traceroute <DEST>
ipconfig tracepath <DEST>
I can connect, but it seems that my account has no access yet¶
You're logging into BIH HPC cluster! (login-1) ***Your account has not been granted cluster access yet.*** If you think that you should have access, please contact email@example.com for assistance. For applying for cluster access, contact firstname.lastname@example.org. user@login-1's password:
This is the most common error, and the main cause for this is a wrong username. Please take a couple of minutes to read the article about how usernames are constructed!
If you encounter this message although we told you that you have access and you checked the username as mentioned above, please write to email@example.com, always indicating the message you get and a detailed description of what you did.
I'm getting a passPHRASE prompt¶
You're logging into BIH HPC cluster! (login-1) *** It looks like your account has access. *** Login is based on **SSH keys only**, if you are getting a password prompt then please contact firstname.lastname@example.org for assistance. Enter passphrase for key '/home/USER/.ssh/id_rsa':
Here you have to enter the passphrase that was used for encrypting your private key. Read SSH Basics for further information of what is going on here.
I can connect, but I get a passWORD prompt¶
You're logging into BIH HPC cluster! (login-1) *** It looks like your account has access. *** Login is based on **SSH keys only**, if you are getting a password prompt then please contact email@example.com for assistance. user@login-1's password:
This is diffeerent from passPHRASE prompt
Please see I'm getting a passPHRASE prompt for more information.
When you encounter this message during a login attempt, there is an issue with
your SSH key. In this case, please connect with increased verbosity to the
ssh -vvv ...) and mail the output and a detailed description to