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Network connection drop at specific time

By rob ·
I have a Windows 2000 client that just within the past week started having a strange problem. This client has been on Windows 2000 for over 8 months. None of the client's hardware or software has been changed since installing W2K. Staring last week, the network connection for this client will dropp automatically at 4:00PM and will re-establish at 4:02PM. Every day at the same time. Network is Windows-based network. I do not have any other clients on this small LAN (around 40 clients) that have this problem. I know that the connection is not dropping at any other time, because I have a small batch file that is looping across the 'time' and 'ping' commands against this client 24/7, just to prove to myself that it was always happening atthe exact same time every day. It is.

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Network connection drop at specific time

by timwalsh In reply to Network connection drop a ...

You've pulled off a major coup in troublethooting a problem like this by establishing a pattern.

The next step will be to look at EVERYTHING happening with this computer (and the network) at the time in question. Check all entries in all logs inEvent Viewer (on both the computer and your DC) for 5 minute in either direction of the time period in question. Check Scheduled Tasks for both the computer and your DC. If you are running Win2K and Active Directory, check and see if any replicatin times might fall during this time period.

The probelm occurs so consistently and precisely, that some scheduled process MUST be the cause.

Did any network configuration changes occur around the time this problem started happening?

Could itbe possible that this problem is occuring on other computers but no one has noticed? I realize you said that none of the other clients are having this problem, but since the connection appears to re-establish itself, it's possible that if no one else attempts to connect to network resources during this precise 2-minute time period, it might go unnoticed.

The bottom line here is that either something happening with the client, or something happening with the server, is causing this problem.The next major coup would be to determine which.

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Network connection drop at specific time

by rob In reply to Network connection drop a ...

The question was auto-closed by TechRepublic

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Network connection drop at specific time

by reference In reply to Network connection drop a ...

Could be power related...Maybe a power tool of some sort from next door goes off everyday at 4:00 p.m., or a heater/air conditioner. Are there any other clients running on the same outlet/breaker? Is this workstation segregated from other workstations in ANY way? Anything different physically? The fact that it happens everyday at 4:00 p.m. indicates a process of some sort(as stated in answer #1), may not be directly related to the workstation though.
Or...
Have you tried using this workstation with a different user logged in? Possibly something within the user profile?? A long shot I'm sure, but there are time restrictions that can be set on users...maybe something wacky happened to the profile.
Also,
Try rebooting, or have the system off for about 10 or 20 minutes then bring it up 5 or 10 minutes before 4:00 to see if it still happens at the same time.
Even though all logic points to a particular process that happens at a precise time, have you tried replacing the NIC? HUB/SWITCH? Changed ports on hub/switch? Cycle power on hub/switch shortly before 4:00?
None of this really makes much sense, but then again, neither does the problem!
Good Luck!

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Network connection drop at specific time

by rob In reply to Network connection drop a ...

The question was auto-closed by TechRepublic

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Network connection drop at specific time

by vurt In reply to Network connection drop a ...

Have you tried changing the time on the pc? See if the problem happens at 4:00pm on the pc when it is actually 2:00pm (for example). This would tell you if the problem is related to the pc or if it is external.

Also type AT at the command prompt and see if there are any scduled tasks set to run at 4:00pm. Probably also work checking power saving settings.

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Network connection drop at specific time

by rob In reply to Network connection drop a ...

The question was auto-closed by TechRepublic

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Network connection drop at specific time

by rob In reply to Network connection drop a ...

This question was auto closed due to inactivity

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