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TCP TANTRUMS?!!

By KahunaNui ·
Got a Win2K Pro system that is giving us intermittent problems with our EL DSL (PPPoE). In every respect, this system ROCKS and gives us no trouble whatsoever. Its just that every once in awhile - EVEN WHILE (get this) we are streaming music (so weKNOW there is a connection) - we are unable to browse, download/upload mail, ping or anything else!!!!!!! When we go over to any of our other systems (running either W95B (OSR-2) or NT4 (S & WS), there are NO problems. Its just this one W2K system. Now, if we just let it sit awhile, many times we can then browse and check the mail just fine. Or we can always reboot and it works...until the next stoppage.

But this is extremely frustrating, not knowing what is up here with the stoppages.We run ZA (earlier 1.x version) but we have the same problems even when we disable it. Seems there is something not quite right in the TCP stack. Does anyone have any clues on what it is, how to trouble shoot?

Mahalo nui loa for your help!

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TCP TANTRUMS?!!

by j.a.lawrence In reply to TCP TANTRUMS?!!

First step is to localize the problem. If you got a copy of SMS 2.0 around (or a network sniffer), install netmon on the system, & do a capture of the TCP stuff coming across the NIC card(s). Netmon is pretty useful, & you can see if you're receiving/sending packets. It may be a WWW (World Wide Wait) coming from your ISP. You can also check the bandwidth available there as well.

If you're seeing NO traffic, then you need to analyze the packets to see who is NACK'ing, your system, or the ISP.

I'd also be tempted to tell you to try another NIC card & reinstall the Service pack on the Win2k box, if you feel that it's leaning towards TCP.

Also check pagefile utilization on the Win2k box. If you've got the drive space, make it bigger &move it off of the System partition drive. You can check out some of this stuff with Perf. Monitor on the Win2K side.

Have you looked in the Event Viewer? Is there anything in there that's entered about the same time as your dead zone?

Also, Check out the Task Manager. Click on the CPU column to sort them low to high & see what processes are running & how much CPU is used. If a process is using a lot of CPU, you can analyze it down father by investigating the threads for that process in PerfMon.

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TCP TANTRUMS?!!

by KahunaNui In reply to TCP TANTRUMS?!!

In the Islands we have something called "Moki's Law". (Very similar to your "Murphy's Law"). Well, as soon as we posted this we haven't had any problems, and have been unable to duplicate the problem described. Go figure...

Now, after closing this out, Moki's Law would again dictate that the problem will immediately return!! ;-) I hope I'm wrong... Thank you very much for your help!

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TCP TANTRUMS?!!

by TG2 In reply to TCP TANTRUMS?!!

Have you checked zone alarms web site?

zone alarm is after all a firewall... and if it freaks ... it could block ports ...

the fact that you can reboot and functionality comes back, and that you can have existing ports open (streaming audio) suggests a software glitch.

get updates for all your applications.. uninstall/reinstall ... etc. Before the hastle of reinstalling the OS .. I would, like answer 1 suggested... use a sniffer to see what it sees, I'd also try installing a different network card... try a different port on your hub or switch, etc..

also .. try pinging yourself.. both the real ip and the loopback (127.0.0.1) when these problems occur and see what response you get. If you get a response from your IP or localhost ip, then look to connectivity as a cause.. cable/port/switch/Nic.

I'm not a windows fan, and even less a fan of reinstalling windows 2000 as I've had several very bad things that would have been non-issues under win 98.. but in general, the stability of Win 2k & especially how it handles networking MUCH better than 98 made 98 unusable for me anymore.

Cheers!!
-T

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TCP TANTRUMS?!!

by KahunaNui In reply to TCP TANTRUMS?!!

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TCP TANTRUMS?!!

by KahunaNui In reply to TCP TANTRUMS?!!

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