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[town0139]

CLient states that FTP is beginning to not connect more often.  When Unix server is rebooted, FTP works fine.  In-house support tech wants to replace the Unix server hard drive.  I don't think that is necessary.  If the hard drive was having problems, many other things would be happening.  HELP!!

[Bob]

It does sound like a server issue but I wouldn't immediately expect it to be a hard drive. Sounds like you could use a unix admin.
If it was me I'd:

1) Check the server load average when ftp is working vs when it's not (type w {and hit enter} at the root prompt)
2) Check to see if the filesystems are filling up (type df {and hit enter} at the root prompt)
3) Check for open TCP connections (netstat -n {and hit enter} at the root prompt when the machine is misbehaving)
4) There is a way to check for stream buffer failures as well (these are kernel parameters that can be tuned). You'll need to look up the syntax for that one, it varies for one version of unix versus another.
5) Look for errors in the unix error logs. Location varies.

[town0139]

netstat -m did show several Stream failures.  After tuning the NSTREAM and NSTRPAGES kernel value, everything is working as it should.