I have a strange problem with a network I look after, here is the setup:
Server1: Runs as Domain Controller, DNS, Routing and Remote access as NAT providing desktops with internet connectivity, DHCP, DNS, 2 NICS: 1 internal, 1 external.
Server 2: Exchange and SQL server, 1 NIC connected direct to SDSL router.
Almost everyday the office looses internet connectivity, I can remote desktop to the domain controler but Internet Explorer does not have a connection, can ping external addresses though. Exchange works fine and desktops have access to shares on both machines. The exchange machine has a internet connection
Restarting the server does nothing to solve the problem, but eventually it will just start working again! There is nothing in the error logs for either machine. Restarting Routing and Remote access server does nothing either.
So in a nut shell:
NAT not working on Routing and Remote Access, no internet connection on Domain Controller but can access it through RDP and can ping external addresses, but Internet Explorer reports no connection. Restart does nothing, eventually starts working again on its own.