We have a network of about 20 clients running XP Pro with a server running SBS 2003. Several clients act as printer servers. The computer with the issue is mapped to 3 of these network printers. As the day progresses, these 3 connections are lost. I cannot just delete them and re-add them. I have to delete all three of them, reboot the computer, then I can add them again and they work again... for awhile. If I only delete one of them, then reboot, that is not good enough. I have to delete all three. It's NOT a network issue in general. All this time I still have internet connection. I still have communication via Outlook with our locally administered MSExchange email system. I can still access the file server. The common thread seems to be the printing. All other PCs in the network can connect and stay connected to these printers. On this particular PC, I can initially connect to these printers and they work OK. But after a few hours, the connection breaks. Other PCs can continue printing to these printers. Also the troublesome PC IS ABLE to ping the PCs which are the servers for these printers. But it cannot connect to the printers themselves until I reboot. Of course I could set these printers up with their own node and IP. But that is not the actual problem, since other PCs can print to them happily as they are.
Recently we had to clean out some malware, but that seemed to complete successfully. But it was right after that process that these symptoms seemed to start. We have Symantec Endpoint Protection. There are NO risks showing in Symantec's log.
At this point I have done the following:
1. Run sfc /scannow.............. no issues indicated.
2. Run ccleaner
3. Run glary utilities....... some registry issues that were repaired.
4. Run CHKDSK /F
In case their might be any issue with spyware or malware... I ran
5. Spybot S&D....... no issues found
6. MalwareByte's Antimalware
Also our Symantec log shows no risks.