We have a Windows 2000 server (std edition, sp4, patched) that on several times a day will seem to lose network connectivity. After suspecting this, I set up a continuous ping test on my PC to it. Sure enough, several times a day it will miss a couple to about 15 pings, during which people cannot access it. There are no events in the event log indicating it has had an issue or thinks it lost connecyion to network. It is a Dell 2650 with 2GB RAM, plenty of free disk space, Broadcom Netxtreme NIC connected at 1 GB. Here is what I've done so far:
Have verified NIC drivers and settings; they are current and correct.
-Went through Windows services, Network settings, Trend Micro A?V settings; found no issues.
-Switched ports on Nortel 5510 switch server plugged into; no difference (an no other servers on switch have had issues)
-Examined server event logs, no errors pointing to network cards or loss of connectivity.
-I started doing continuous pings with ever larger packets up to 20000 bytes, no drops or loss.
-I set up performance monitor and have been watching disk, memory, CPU etc and really don't see anything happening when the pings drop. It does seem to happen when the server is busy but its not pegged out.
At this point I am not sure what else to look at since its not showing any errors or issues except the momentary ping drops and loss of connectivity.