At my work, we have a jump host over which I must connect to the cluster. Usually, the connection statement would be
ssh -t herp@jumphost ssh cluster
Furthermore, this connection has to be made from within the companies VPN. Now, I want to connect to cluster using VS Code on Windows 10. This creates several problems. This blog post suggests to use the ssh config file for this so I added the following lines to C:UsersHerp.sshconfig:
Host jumphost
HostName jumphost
User herp
Host cluster-work
User herp
HostName cluster
ProxyCommand ssh -tt jumphost
Then, when I try to connect using cmd.exe or the PowerShell I get:
$ ssh cluster -v
OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
debug1: Reading configuration data C:\Users\Herp/.ssh/config
debug1: C:\Users\Herp/.ssh/config line 18: Applying options for cluster-work
debug1: Executing proxy command: exec ssh -tt jumphost
debug1: identity file [...]
[...]
debug1: identity file [...]
debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1
herp@jumphost's password: <I enter the PW>
debug1: kex_exchange_identification: banner line 0: Last login: Mon Jun 28 20:50:42 2021 from <some IP>
debug1: kex_exchange_identification: banner line 1:
debug1: Remote protocol version 2.0, remote software version OpenSSH_for_Windows_8.1
debug1: match: OpenSSH_for_Windows_8.1 pat OpenSSH* compat 0x04000000
debug1: Authenticating to cluster:22 as 'herp'
debug1: SSH2_MSG_KEXINIT sent
Bad packet length 218783296.
ssh_dispatch_run_fatal: Connection to UNKNOWN port 65535: message authentication code incorrect
Sometimes, the last few lines are instead
debug1: kex_exchange_identification: banner line 0: Last login: Mon Jun 28 20:50:42 2021 from <some IP>
debug1: kex_exchange_identification: banner line 1:
debug1: kex_exchange_identification: banner line 2: 33]0;herp@cluster:~ 33[?1034h[herp@cluster ~]$ SSH-2.0-OpenSSH_for_Windows_8.1
debug1: kex_exchange_identification: banner line 3: -bash: SSH-2.0-OpenSSH_for_Windows_8.1: command not found
debug1: kex_exchange_identification: banner line 4: 33]0;herp@cluster:~[herp@cluster ~]$
If I use -t instead of -tt in the ProxyCommand, the last few lines before and after I enter the password are
Pseudo-terminal will not be allocated because stdin is not a terminal.
herp@jumphost's password: <I enter the PW>
-bash: line 1: $'SSH-2.0-OpenSSH_for_Windows_8.1r': command not found
and then cmd.exe freezes so that I have to close the window.
How can I get this connection to work?
