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Intermittent Server Connectivity

I have a 4 machines, all running windows 7 pro. They are all on the same domain connected to a server. The server acts as our domain controller and also our DNS server. A router handles our DHCP.

I have 2 machines that are intermittently dropping server connectivity. These two machines will be referred to as 1 and 2.

Machines 3 and 4 have no connectivity issues whatsoever.

Machines 1 and 2 will work all day and then come morning, they don't have access to the mapped drives on the server.

Once they are restarted they connect back and everything seems good.

I have checked both DNS and DHCP settings on all 4 PC's and they're identitcal. DHCP seems to be working as I can release and renew IP's on all 4 machines, and I also checked the DNS by pinging IP's outside the network and also by their FQDN's. (google and bing)

Any ideas why machines 1 and 2 could be losing connectivity?
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Hemil Aquino
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Possible causes:

1- IP conflict.
2- Network card drivers needs to be updated.
3- Check the switch port.
4- Check patch cord from the computer to the wall.
5- Check the wall jack make sure is working.
6- If you have an anti virus try disabling the firewall.
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ASKER

We have internet connectivity, we just keep losing the mapped drives on the server. We can ping the server with no packet loss or latency.
Have you check your DNS, Can you try mapping those drives manually via IP instead of name resolution?
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when you open My Computer, is there a red x on the mapped drive?

If so, just click on it and the share should open up. close the window - no reboot required.
Mapping by the IP worked. Now we'll need to see if they drop connectivity within the next day or so.
Wait for few days, if the drives doesn't get disconnected then your problem is DNS issues.
The drives stayed mapped all weekend and haven't lost connectivity. Looks like a DNS issue.
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Hemil Aquino
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