This has been driving me nuts for 2 days and MS won't let me open a ticket because the environment has servers running on Virtual Box (don't ask).
Here's what's going on:
I have a client running a lot of old hardware. I mean, a lot. But they never had connectivity issues until recently. Basically what's happening is that every client machine loses network and internet connectivity for a few seconds. This is intermittent. It happens to some machines at the same time, others at different times. It's really weird.
For the most part, they're connecting mainly to their DC which has a lot of shared drives and their active sync drives on it. That machine isn't losing connection (that I can tell. I could remote into it when they had an extended downtime yesterday and couldn't connect internally). So it sounds like an issue with the switch then, right? Well, maybe. I restarted the switch and the problems persisted.
I did find a loopback on their 2 switches, though. That was removed towards the end of business hours yesterday. The connectivity problems continued until I restarted their DC about an hour ago. There has been no complaints since.
Well, a few people tell me they had issues following the restart but I'm questioning their perception of time. I'm still trying to run this down to be sure.
The DC is Server 2003 SP2 and most of the clients are XP SP2 (I know) but there are a few 7 SP 1 machines in there having the same issue.
Could the problems caused by the loopback linger after it was removed or could this be something else entirely? Let's assume their 2 switches are good as I'll be testing those on my own.