Cannot connect to yggdrasil from astro

HPC Support HPC issues
1

Hello,

I can successfully connect to bonsai. However, when I am trying to connect to Yggdrasil/Baobab after the SSH-key change, it fails with:

connect to address 129.194.9.68 port 22: Connection refused

I should not be an authentication issue since I do not get a permission denied report and it also fails when using:

ssh -F /dev/null -vvv cenci@login1.yggdrasil.hpc.unige.ch

Any clues why this happens?

Thank you.

Elia

2

Dear @elia.cenci is this still blocked?

We are using fail2ban to block IPs which do too many connections with wrong credentials.

See this faq for more information.

3

Hello,

Yes, it is still blocked. Is there any diagnostics I shall run to find out what the problem is?

I have tried the following with corresponding output:

Host: login1.yggdrasil.hpc.unige.ch
Resolved IP: 129.194.9.68
Command: nc -G 5 -vz login1.yggdrasil.hpc.unige.ch 22
Result: Operation timed out
ping result included: Communication prohibited by filter from isdcrouter.isdc.unige.ch (129.194.168.1) Source shown: 10.195.169.154

Best,
Elia

4

I see! Until the security issue is solved by Astro IT, you need to be connected either by Wi-Fi or VPN from the Astro department to reach Yggdrasil.

5

Thank you, with the WiFi it works. I was connected via the cable, as we were instructed to do.