ipv4 connection problems

Peter Avalos pavalos at theshell.com
Sat Mar 5 13:03:52 PST 2005

Over the past few weeks I've been having a problem with Apache not
responding to port it's listening on.  After some investigation, I
was able to determine that it was only happening on ipv4.  IPv6 was
working just fine.  If I restarted the server, everything would be fine
for about an hour or so (depending on traffic), and then it would
start up again.  I figured this was an Apache problem, since it was
only happening with my web server.

Today, I was stressing out my ftp server (the vanilla base version),
and I saw that it was doing the same thing my web server was doing:

box:~% telnet -4 theshell.com 21
telnet: connect to address Operation timed out
telnet: Unable to connect to remote host

And without doing anything...

box:~% telnet -4 theshell.com 21
Connected to theshell.com.
Escape character is '^]'.
220 box.theshell.com FTP server (Version 6.00LS) ready.
221 Goodbye.
Connection closed by foreign host.

Note:  This is not a network connectivity issue since those telnets
are on the same box (box is

Again, ipv6 seems to work just fine.  Other than this, I don't really
know what other information I can provide that can help in finding
where the problem is.  Any thoughts?


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