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
Trying 209.200.146.2...
telnet: connect to address 209.200.146.2: Operation timed out
telnet: Unable to connect to remote host
And without doing anything...
box:~% telnet -4 theshell.com 21
Trying 209.200.146.2...
Connected to theshell.com.
Escape character is '^]'.
220 box.theshell.com FTP server (Version 6.00LS) ready.
quit
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 209.200.146.2).
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?
Peter