Here we meet again, mysterious SSH connection error. This time it only affects SLES system when connection from a regular Debian Wheezy via SSH. Also Putty.
ping works, SSH connection in verbose mode stops at
channel 0: open confirm rwindow 0 rmax 32768
Authentication via public key has been done at this point, the Server logs "Accepted publickey [...] ssh2", and then it all just hangs. This error appears at random (oh how i hate these randomly occuring annoying errors...) and seems to be connected to machines running SLES11 only. Connections from a RedHat System are NOT affected. I can connect from these WHILE it stopped working. Putty is also affected.
I can't stop the ssh client except with kill -9 from another console. It's like a total freeze. It stops working at a random point while working via ssh and then starts to work again after a random but usually VERY long time.
Restarting sshd does not help. Reboot does. Interestingly, I can open up a bash with something like
ssh root@my-foo-server /bin/bash
which is however only rudimentary, so commands like ls or cd work just fine, top fails with
TERM environment variable not set.
Here's the tail of an strace on the client side (IP: 18.104.22.168): http://pastebin.com/XGTWnp6V
So yeah. I did not change anything from the defaults. It happens on fresh installs as well. iptables has been disabled on both machines, the server even has is + all components of it disabled in the kernel. Too bad it even occurs on a production machine for users, which is bad.
What could be the issue?