Hi, We're running an openssh server on a linux box here to give developers access to our machines from outside the firewall. A number of us, using various ssh clients (Mac, Windows and Linux) regularly experience hung sessions. I'm hoping that someone can give me some insight into what's happening here or, at least, some tips for characterizing the problem well enough for it to get fixed. Let me try to describe what happens. I usually have two or three ssh sessions active from my home machine to this server. A few minutes after these are established (sometimes it takes much longer), one of them will suddenly stop responding while the others remain active. If I kill the dead session, it's always possible to open another session immediately. I've discovered that these dead seesions are only dead in one direction. That is, things I type into my dead ssh window continue to get transmitted to the server, but the response from the server isn't transmitted back to my home machine. I know this because (a) I can tell that commands typed blindly into the dead session are properly executed, and (b) running netstat on the server machine reveals that the Send-Q starts growing dramatically for the dead connection. So, both the server and the client consider the connection to be active ("ESTABLISHED"), but nothing is transmitted from the server to the client. Any idea what could possibly be going on here? As I mentioned, people using various different clients have experienced this problem, so it seems clear that it's a server problem of some sort. The Linux system sshd is running on is, unfortunately, a non-standard version based on the 2.0.28 kernel. We're running OpenSSH-1.2.1, protocol version 1.5. Thanks, Tom ------------------------------------------------------------------------- W. Thomas Pollard Schrodinger, Inc. pollard at schrodinger.com http://www.schrodinger.com/ -------------------------------------------------------------------------