Computer loses contact with only 1 server

we have 3 servers.  all servers and client computers are on 1 domain.

one client computer has had the following issue on two occasions:
computer loses contact with one server only.  this computer is unable to ping the server by name, and pinging by IP yeilds the error "Destination host unreachable".  computer is able to ping other computers in the network, and the other two servers, and computer can access the internet.

reboot resolved the problem on both occasions, but i want to know why it happened, or what troubleshooting steps i can take next time in order to help determine why it is happening.

computer in question is xp pro with all service packs and updates.  firewall is disabled.
server in question is windows 2000 server.  it hosts an SQL database that is used by an application which is run from client computers in the domain.
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zephyr_hex (Megan)DeveloperAsked:
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Jay_Jay70Commented:
Hi zephyr_hex,

i would as normal start with the logs

Cheers!
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zephyr_hex (Megan)DeveloperAuthor Commented:
i will check the event log tomorrow
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zephyr_hex (Megan)DeveloperAuthor Commented:
there are no errors in the event log anywhere near the time this occurred yesterday
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Jay_Jay70Commented:
hmm i have no idea ten, i can see why you would suddenly get unreachable    are you certain the problem is at the client end?
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zephyr_hex (Megan)DeveloperAuthor Commented:
i am not 100% sure, but i can't imagine it could be anything but the client... maybe i am wrong on this assumption.

there are over 20 client computers in the network.  this problem has occurred twice, and both times on the same client.  the server it loses contact with does nothing other than host an accounting software with SQL database.

what other things can i do to troubleshoot this issue if it arises again (and it may be awhile before it happens again because that client computer has been relocated and has been moved from a wired, domain connection to a wireless, terminal server connection.  so the client is no longer accessing the database server directly...  the client connects to the terminal server, which in turn accesses the database server).
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Jay_Jay70Commented:
no idea - if it is just the one client then it could be some form of corruption on it and its way to hard to narrow that down without a constant problem
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