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I'm investigating a timeout issue with an SFTP process running on a remote server and noticed that our server's version of OpenSSH is 3.9 while the remote server is running version 4.3. Would this potentially cause a problem?

By the way, we've already added the following to the ssh_config file and it doesn't seem to be helping: 

ServerAliveInterval 100
ServerAliveCountMax 5

Here's the error message we're getting: 

sftp> Connecting to xxx.xxx.com...
sftp> Uploading Advisor_20120113.csv to /home/me/Advisor_20120113.csv
Disconnecting: Timeout, server not responding.
Write failed: Connection timed out
Couldn't read packet: Connection reset by peer

Before adding the ServerAlive property values, this is the error message that was showing up in the logs: 

sftp> Uploading Advisor_20111113.csv to /home/me/Advisor_20111113.csv
Read from remote host xxx.xxx.com: Connection timed out
Couldn't send packet: Connection reset by peer

The weird thing is that sometimes the transfer works just fine and all the files are copied over. While other times, only one file gets transferred.

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If you connect a normal ssh session, does it have timeout issues as well? – Chris S♦ Jan 19 at 19:45
@ChrisS - Unfortunately, I only have SCP/SFTP access to the server, not SSH. – Brian Jan 19 at 19:50
Possible bad NIC card or shady network connection? You can check dmesg for odd messages/errors concerning the NIC. – Tim Jan 19 at 21:21
So I tried using SCP instead of SFTP and it didn't timeout - weird. – Brian Jan 20 at 12:57
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