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We have one server with Windows 2003 R2 and some network services running on it, including 3rd party "1C:Enterprise" accounting service. In some time, server drops all connections from some client machines (all others are still working) without any reason. After 5-15min, access restored.

When it happening, from that machine we can't even ping server or get access to any its service. But, from other PC, standing nearby, all working fine with the server. I thought it was an issue with client PC, but when it happening, all except the server is working from the client machine. Therefore, there is no client network problem.

Sounds like the server denies all access only from some client machines for 5-15min, after then access restores.

Some additional info: the firewall is disabled on client machines and enabled on server. There are no any error messages on client logs or server side, when block in the progress.

Any thoughts, why it happens? Thanks.

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Are the client machines in the same VLAN as the server? If they are in the same VLAN is the server answering to ARP requests? Try arping or clear the arp table, ping the server and see if you see the mac address in the arp table. If you have an IP conflict you will receive 2 answers for arping. –  Mircea Vutcovici Dec 10 '10 at 6:15
    
There is no VLANs at all, only usual Ethernet network. I see, that client's IP address doesn't change before and after this blocking. There is no IP conflicts, because all clients obtain addresses from the same DHCP server. –  Denis Dec 10 '10 at 7:12
    
Anyone? It's still actual. –  Denis Dec 10 '10 at 14:51
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