Hi all. New forum member here... I'm hoping this brain trust can help shed some light on a weird issue we're having.
We have a relatively small server farm (~25 servers) running in a hosted VMware environment. We recently stood up our first instance of Server 2012 R2 (majority of the network is 2008).
The new 2012 R2 server loses connection to its default gateway on a fairly frequent basis; once every 24-36 hours. When investigating, the NIC is still enabled and the IP parameters are still correct, but we have no layer 3 connectivity to the local network, therefore no connectivity to remote networks. Running through the native troubleshooting/repair feature of Windows or rebooting temporarily resolves the problem.
Some facts about this case:
- This is member server in a single domain/forest with a functional level at 2008 native
- There is one local domain controller, one remote via a site to site VPN
- Wireshark indicates layer 2 is still active (periodic broadcasts are received)
- There are no significant Event Log entries indicating an error leading up to the issue
- The routing table looks normal after the event has occurred
Some troubleshooting steps taken so far:
- Added a new VMWare NIC and moved the IP address to it
- Dropped/re-added the server from the domain
It should also be noted that the only real role/function of this server is IIS hosting a single and fairly low volume public web site.
Any ideas where I should go next?