Comment 12 for bug 174168

I have the same problem ssh'ing from a 11.04 box (running openssh 5.8) to a 10.04 box (running openssh 5.3). I've tried with three different clients all on the same network, two of with have 11.04 and one of which has 10.04. All are connecting to the same server Only the 10.04 box is able to connect. I believe the MTU's are the same on all the boxes.

This seems like an incompatibility between different versions of OpenSSH.