My site inaccessible on multiple computers

[Dhonn Lushine]

I've already had a run-around with GoDaddy and they think it's on my end.

I've replaced my network gear, cable modem, router and switch, without this problem being resolved.

I have no firewall on the server or on any client computers. The only firewall is the default firewall provided by the router.

I am only having this problem with Linux and this problem doesn't happen in XP ever!

Now here is my problem:

When I access my site http://www.osversion.com or the dedicated ip address associated with it, I can only do it from one ubuntu computer at a time! The other ubuntu computers on my network must wait it's turn. From my tests it seems that there is some persistent connection problem.

Here is a test on a box that is going to start a connection with the server. Take note of the time it takes. (Obviously we are not allowed in, it's not the point)

gargamel@hpx2:~$ time telnet osversion.com 3306
Trying 68.178.191.123...
Connected to osversion.com.
Escape character is '^]'.
THost 'ipXX-X-XXX-XX.sd.sd.cox.net' is not allowed to connect to this MySQL serverConnection closed by foreign host.

real 0m0.181s
user 0m0.000s
sys 0m0.008s

At the same time on a second computer on my network, I am going to run the same command about a second later.

dhonn@gq:~$ time telnet osversion.com 3306
Trying 68.178.191.123...
Connected to osversion.com.
Escape character is '^]'.
THost 'ipXX-X-XX-XX.sd.sd.cox.net' is not allowed to connect to this
MySQL serverConnection closed by foreign host.

real 1m33.165s
user 0m0.008s
sys 0m0.000s

It will connect but only after 1m33s. And this always happens in this manner. It's always around 90 seconds! If I run that command 30 seconds after the other computer it will take 60 seconds, etc, etc..

Now if I do one more time on that box after the 90 second wait, it will be back to normal.

dhonn@gq:~$ time telnet osversion.com 3306
Trying 68.178.191.123...
Connected to osversion.com.
Escape character is '^]'.
THost 'ipXX-XX-XX-XX.sd.sd.cox.net' is not allowed to connect to this
MySQL serverConnection closed by foreign host.

real 0m0.180s
user 0m0.004s
sys 0m0.000s

I can repeat the same process over and over and over again, and it simply never goes away.

This problem happens to any port, 22, 3306, 80, whatever, you can mix and match these ports and the results are the same.

All trace route or ping activity goes through perfectly.

It is important to note that Windows XP does NOT have this problem. I can connect to the osversion.com simultaneously on XP.

I found this bug when my girlfriend and I was checking out my new site. We notice that it was not responding on the other computers and being really flaky. We simply couldn't use the website at the same time!

[Dhonn Lushine (dhonn)]

I'm putting up a firewall on this system. I'll leave port 80 open. As I've said before all ports have this problem.