Calling Fellow Techs

Coffee Warlord · 10-31-2003, 11:17 AM

Bizarrrrrrreee problem that I just cannot even fathom here. See if any of you network-minded folk have any ideas.

We have a server on the outside world (bigdog). Bigdog runs most of our services, including mail.

The outside world can connect to pop3 (port 110) on bigdog just fine.

I, at our local office network, running linux, can connect to pop3 on bigdog just fine.

A mac user at our local office can hit it just fine.

The windows machines at our local office CANNOT access port 110 on bigdog. Noone else, locally or otherwise, has this problem.

The windows machines CAN hit other machines running pop3 just fine.

What.

The.

Fuck.

Fritz · 10-31-2003, 11:32 AM

can the windows machine hit another service on BigDog?

Franklinnoble · 10-31-2003, 11:48 AM

Are you running any anti-virus software on the Windows machines?

Franklinnoble · 10-31-2003, 11:50 AM

Also... are the windows machines configured to connect to the internet via proxy server?

Poli · 10-31-2003, 11:52 AM

Solar flare.

primelord · 10-31-2003, 11:55 AM

Quote:

Originally posted by Fritz
can the windows machine hit another service on BigDog?

That is the first thing you should probably check. Can the windows box ping BigDog? (Assuming you aren't filtering that sort fo stuff.) Have you checked the popper logs on BigDog to see if the Windows box is in fact recahing the server, but then the server is dropping the connection for some reason.

Assuming BigDog is a Linux box is it running IPtables? Is it possible an IPTable got added to deny the connection from the windows box?

The Afoci · 10-31-2003, 12:19 PM

I think it has to do with they hydrocolator. That or terrorists.

Coffee Warlord · 10-31-2003, 12:29 PM

To answer a few questions.

The problematic windows machines CAN access all other services on that machine.

My guess, however strange, is that the addresses in our IP range are being filtered (I can't confirm this due the firewall being run by the hosting company, not in our control - they are a pain to contact). The question remains if this is sane or not, since non-windows boxes in the same IP range can get through just fine.

Furthermore, I tested this problem from a few people outside our office on our same IP. You can rule out local firewall settings from the office. Seems anyone with our ISP running windows cannot access port 110 on that server, and that server alone.

primelord · 10-31-2003, 12:47 PM

Maybe the server is choking on something comeing from the e-mail client. Have you tried using telnet to access? If you go to Run and then type:

telnet servername 110

If it connects you will see something similar to

Ok qpop+

Or something like that depending on whot POP3 software you are using. If you see that then it's not a filtering issue. If it just hangs and then dies then the connection is getting dropped somewhere whether it be the hosting firewall or a host based firewall on the server.

Coffee Warlord · 10-31-2003, 12:56 PM

That's how I've been testing it (telnet into port 110 instead of clients). No workie.

Glengoyne · 10-31-2003, 01:04 PM

Hmm, if it was IP filtering, or a firewall blocking port 110, wouldn't that stop ALL the traffic, and not just the Windoze machines?

Glengoyne · 10-31-2003, 01:07 PM

Dola,

Also can you telnet bigdog 110 from the Linux boxes?

What about a DNS issue, are the Windoze boxes resolving names differently? Nevermind you said they could ping bigdog, so that doesn't sound like it. What about local routing? Any special port forwarding going on?

Coffee Warlord · 10-31-2003, 01:07 PM

That's what I was figuring, hence the reason I'm confused as all hell.

Unless somehow the packets windows sends are different, and the firewall is treating them differently than linux packets.

Which makes no sense.

In short, this makes no sense. I've since moved our mail to an alternate server that we can access, but I still have no friggen clue WTF was going on there.

Fritz · 10-31-2003, 01:39 PM

have you sniffed the mail packets?

Coffee Warlord · 10-31-2003, 01:40 PM

They smell like chicken.

Good thought, we'll see.

Franklinnoble · 10-31-2003, 01:42 PM

Sniffing male packages is Fritz's specialty... perhaps you should retain him as a consultant.

cuervo72 · 10-31-2003, 01:42 PM

Is BigDog the H.S.I.C?

Fritz · 10-31-2003, 01:43 PM

This is screaming network error. Perhaps the packets are being misrouted.

remember to sniff on the outside of your firewall. That will at least tell you if they are leaving.

If you can get help on the other end they should be able to see the packets arriving.

10-31-2003, 11:32 AM	#2
Fritz Lethargic Hooligan Join Date: Oct 2000 Location: hello kitty found my wallet at a big tent revival and returned it with all the cash missing	can the windows machine hit another service on BigDog? __________________ donkey, donkey, walk a little faster Last edited by Fritz : 10-31-2003 at 11:33 AM.

10-31-2003, 11:52 AM	#5
Poli FOFC Survivor Join Date: Apr 2002 Location: Wentzville, MO	Solar flare. __________________ Cheer for a walk on quarterback! Ardent leads the Vols in the dynasty forum.

10-31-2003, 12:19 PM	#7
The Afoci Pro Rookie Join Date: Jan 2003 Location: Moorhead	I think it has to do with they hydrocolator. That or terrorists. __________________ I had something.

10-31-2003, 12:47 PM	#9
primelord Pro Rookie Join Date: Oct 2000	Maybe the server is choking on something comeing from the e-mail client. Have you tried using telnet to access? If you go to Run and then type: telnet servername 110 If it connects you will see something similar to Ok qpop+ Or something like that depending on whot POP3 software you are using. If you see that then it's not a filtering issue. If it just hangs and then dies then the connection is getting dropped somewhere whether it be the hosting firewall or a host based firewall on the server. __________________ .

10-31-2003, 01:39 PM	#14
Fritz Lethargic Hooligan Join Date: Oct 2000 Location: hello kitty found my wallet at a big tent revival and returned it with all the cash missing	have you sniffed the mail packets? __________________ donkey, donkey, walk a little faster

10-31-2003, 11:48 AM	#3
Franklinnoble Banned Join Date: Jul 2002 Location: Placerville, CA	Are you running any anti-virus software on the Windows machines?

10-31-2003, 11:50 AM	#4
Franklinnoble Banned Join Date: Jul 2002 Location: Placerville, CA	Also... are the windows machines configured to connect to the internet via proxy server?

10-31-2003, 12:29 PM	#8
Coffee Warlord Head Coach Join Date: Oct 2002 Location: Colorado Springs	To answer a few questions. The problematic windows machines CAN access all other services on that machine. My guess, however strange, is that the addresses in our IP range are being filtered (I can't confirm this due the firewall being run by the hosting company, not in our control - they are a pain to contact). The question remains if this is sane or not, since non-windows boxes in the same IP range can get through just fine. Furthermore, I tested this problem from a few people outside our office on our same IP. You can rule out local firewall settings from the office. Seems anyone with our ISP running windows cannot access port 110 on that server, and that server alone.

10-31-2003, 12:56 PM	#10
Coffee Warlord Head Coach Join Date: Oct 2002 Location: Colorado Springs	That's how I've been testing it (telnet into port 110 instead of clients). No workie.

10-31-2003, 01:04 PM	#11
Glengoyne Grizzled Veteran Join Date: Sep 2003 Location: Fresno, CA	Hmm, if it was IP filtering, or a firewall blocking port 110, wouldn't that stop ALL the traffic, and not just the Windoze machines?

10-31-2003, 01:07 PM	#12
Glengoyne Grizzled Veteran Join Date: Sep 2003 Location: Fresno, CA	Dola, Also can you telnet bigdog 110 from the Linux boxes? What about a DNS issue, are the Windoze boxes resolving names differently? Nevermind you said they could ping bigdog, so that doesn't sound like it. What about local routing? Any special port forwarding going on?

10-31-2003, 01:40 PM	#15
Coffee Warlord Head Coach Join Date: Oct 2002 Location: Colorado Springs	They smell like chicken. Good thought, we'll see.

10-31-2003, 01:42 PM	#16
Franklinnoble Banned Join Date: Jul 2002 Location: Placerville, CA	Sniffing male packages is Fritz's specialty... perhaps you should retain him as a consultant.

10-31-2003, 01:42 PM	#17
cuervo72 Head Coach Join Date: Dec 2002 Location: Maryland	Is BigDog the H.S.I.C? __________________ null

10-31-2003, 01:43 PM	#18
Fritz Lethargic Hooligan Join Date: Oct 2000 Location: hello kitty found my wallet at a big tent revival and returned it with all the cash missing	This is screaming network error. Perhaps the packets are being misrouted. remember to sniff on the outside of your firewall. That will at least tell you if they are leaving. If you can get help on the other end they should be able to see the packets arriving. __________________ donkey, donkey, walk a little faster Last edited by Fritz : 10-31-2003 at 01:44 PM.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)