How to fix request failed on channel 0

Question

When I want to connect to my server like this

ssh -a username@my-server.de -p 22

it gives me two error messages:

PTY alloca         


        

Answer 1

I occasionally see this when spinning up a VM. Our automation system starts applying updates, so depending on timing can hit an update to critical packages.

Upshot - this might happen if ssh or other related packages are being updated on the destination machine.