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XP machine loses connection with other XP machine on LAN

I am setting up a small office network.  There are 2 XP machines. There are 2 folders on one of the XP machines that need to be shared. There is no server, it is a peer to peer network.  The 2 XP machines have static IP’s.  The second XP machine will connect to the network and access the host XP folders but after 15 to 30 minutes it no longer sees the other machine.   I am able to ping the host XP machine while the problem is occuring.   I expect that it is a DNS problem but I don’t know what to do with it.  The XP desktop that loses connection is SP 3 and has Norton antivirus installed.  I have tried shutting down the firewall and disabling Norton but the problem continues.  I am thinking of deinstalling Norton but hate to do so because I’m not sure that is causing the problem.  I am going back to the customer location tomorrow.  I would appreciate any ideas to help get this resolved.
1 Solution
Have you triied connecting to the machine via IP address rather than hostname, for example \\\sharename rather than host name?

This will eliminate any DNS issues as DNS would not be involved.

I would think maybe Norton is having something to do with this.

Disable Norton completely, and disable windows firewall and see what happens.

If the issue no longer occurs you know it's a firewall problem.
Check Firewalls, and use ip's   yup..
Check the Power Management Tab of your network card. You can go to Device Manager, search for your network card, right click then properties then Power Management. Make sure that that the "Allow computer to turn off this device to save power" checkbox is not checked.

When your network card goes off, it will lose the connection and all the information which is why you'll need to re-establish the connection (e.g. hostname and sharename, etc. )
make sure both machines having Lan connection with 100mbps.
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