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Intermittant Network Failure

By ajhenley ·
Last weekend we moved all of our servers into the new datacenter. One of the servers (the PDC/file server) has been suffering intermittant network outages since then. All the machines sit side by side and use the same switch and this is the only machine w ith this problem. We have tried switching network cards and cables with machines that work and have yet to isolate the problem. Incidentally, everything was a-ok in the old data center. We are using NT4/sp3 running at 100BT with 3com 3c597 network cards i nstalled in Compaq Proliant servers. Any ideas?

P.s. IP numbers were changed, but the switch is not overloaded. We checked.

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Intermittant Network Failure

by OnePerson In reply to Intermittant Network Fail ...

Is the switch located in the same room? Might check to see if there are any high power products (UPS, fluorescent lights, air conditioner) near the network cable or machine.

What IP address did you give it? If you have a Class C ending in .0 or .255, you're probably giving it an invalid address. Otherwise, ensure that nothing else is trying to grab that same IP.

Michael - MCSE

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Intermittant Network Failure

by ajhenley In reply to Intermittant Network Fail ...

The question was auto-closed by TechRepublic

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Intermittant Network Failure

by ccs In reply to Intermittant Network Fail ...

Michael had a good answer with the IP conflicts, I've seen that happen myself. Ask yourself, "When do the network outtages occur", if its between 9-5 then there may be a rogue terminal trying stealing the IP address. PDC's must have a static IP address, if your using DHCP does your scope exclude the reserved IP addresses used by your servers?

You also may want to plug into a different port on the switch. We had an incident here just recently where certain ports would get overloaded forcing us to reset the switch... a real B*TCH to do since it knocks off all users on that switch.

Also, I am assuming you are running the Cat 5 cable directly into the switch and not relying on network wall jacks and internal wiring? If so thats another possibility...

Last resort might be to isolate the most frequent times of the outtages (as mentioned above) and take down the PDC (if possible) and run it on its own separate network to see if it goes down... isolate the cause as server related or wiring/hardware.

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Intermittant Network Failure

by ajhenley In reply to Intermittant Network Fail ...

The question was auto-closed by TechRepublic

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Intermittant Network Failure

by Ian.mumford In reply to Intermittant Network Fail ...

Is there a mismatch between the switch port setting and the server Lan card eg. switch set to autonegotiate Full/Half Duplex and 10/100 Mbs,but failing to detect the Lan card settings ?

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Intermittant Network Failure

by ajhenley In reply to Intermittant Network Fail ...

The question was auto-closed by TechRepublic

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Intermittant Network Failure

by lgsmith In reply to Intermittant Network Fail ...

Did you use a cable tester to check your cable and not a continuity tester but one that can stress your cable and actualy put RF on your line. If not try switching a cable from a good server to this one and see if the problem follow. If have seen just the lenght of cable be such that it will stop a connection cold, this is why I use a real cable test such as a Fluke. Make sure it is of the newer type that can put 100mb on this line.
I like the port idea also to switch ports, and Floresent lights keep away, also you can test your network card through diagnostics. Just a note I have a client right now who ran there wire right on top of there lights and they get intermitant disconnects.

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Intermittant Network Failure

by ajhenley In reply to Intermittant Network Fail ...

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Intermittant Network Failure

by ajhenley In reply to Intermittant Network Fail ...

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