Unable to Access PC's on domain via IP or DNS

Microsoft Windows server 2003
February 15, 2010 at 10:39:55
Specs: Windows Vista

I'm having an issue where my server 2003 R2 edition can't access PC's on the domain for a short period of time.

The PC in question will respond to pings and can be accessed from another server that is identical in every way (hardware\software)as the one I'm having issues with. When I hop on the identical server I can access this PC via DNS or IP without any issues. When I go back to my original server, I get the error saying I don't have permissions (but I do) and that the server cannot perform the requested operation.

I've tired flushing the DNS, restarting the network adapter and this won't fix the issues.

This happens with this server almost daily and its random with what PC it won't be able to access.

I don't see anything in the even logs and when this is happening I can access other PC's just fine without a hitch. I have also noticed, it is never more than one pc that is effected at a time.

Any help would be greatly appreciated.

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February 15, 2010 at 11:00:33
Using remote desktop to access?

Sounds like in your testing you are leaving connections open which results in the next attempt being refused.

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February 15, 2010 at 11:34:19

I am not using remote desktop and actually, but I can remote into it just fine with using RDP.

I'm just going to run then \\ip address or \\dns name and this is where I get my error message. All pings and tracerts come back successful and as I mentioned earlier, other PC's and servers can access this machine.

What happens is we have some software that just logs into the shared file, checks for a folder and does a quick tally of how many files are in that folder. This runs once a day and runs fine on over 100 pc's. But once a day, a pc here and there will not be able to be accessed from the server, yet other pc's and servers can access just fine.

I went to the PC and did find this in the event logs. " The server was unable to allocate from the system nonpaged pool because the server reached the configured limit for nonpaged pool allocations." but this is the first time I've seen this show up on a PC that was in question so I'm not sure if its part of the issue or not.

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February 16, 2010 at 20:37:25
Have you talked to the software's techsupport? I suspect this is a known issue.

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February 17, 2010 at 07:57:15

I am the software tech support and I wrote the software.. Its nothing that the software can cause since all it does it go to the PC and take a count of how many items are in the folder. This is an issue with The server itself due to the fact that the server's clone/backup server has no issues contacting that machine while the orginal server does have this issue.

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February 17, 2010 at 08:32:33
This could be a faulty switch... can you put the server in question in another switch, or at least another port? Just for testing, if the problem suddenly stops you have your solution. Plus, it takes no time and does no harm.

But it could be anything, I'm just suspecting faulty switches as it happens from time to time and usually leaves intermittent errors that takes days to find...

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February 17, 2010 at 08:35:17
Ah good suggestion about the switch.. Both servers are running off the same switch but I'll swap it out anways. Thanks for the idea, I'll let you all know if it works.

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