We've been seeing an increased problem where pages won't load yet we can ping normally. DNS appears to be resolving OK. Rebooting the client's computer temporarily fixes it.
This is happening more and more in several of our systems in different communities using different T1s from different providers, and in one case a satellite connection. Running Ad-aware and Spybot and updating AV software on the client machines doesn't seem to help. We're using various brands of wireless CPE and the only thing all systems have in common is Mikrotik routers at the POP, although some of them have been running for a couple years and have not had this problem until recently. I have a hunch, not yet verified, that the problem only happens when clients are not behind a router, and am wondering if the problem is a compatibility issue between Mikrotik and maybe a recent Windows update. Anybody else seeing this?
I've tried temporarily disabling web proxy and DNS cache in the MT but doesn't seem to make any difference.