Hello, I've been using OpenSSH 3.6.1p2 for quite some time at work. We have a firewall, and I had no problems connecting to external machines. Today my machine was updated to version 4.1p1 and it has a problem. When I try to make an SSH2 connection to an external machine, everything seems to work right up to the very end: debug1: Authentication succeeded (publickey) debug1: channel 0: new [client-session] debug1: Entering interactive session. Received disconnect from 192.74.137.71: 2: Invalid ssh2 packet type: 192 I did some investigation and see that an "invalid packet check" was added to packet.c a few years ago, sometime between versions 3.6 and 3.9. But I have no idea why this now causing problems or how to diagnose it. Can anyone help me understand what this means and how to fix it? Thanks.