I have a TMG 2010 server using ISP Failover.
The Primary ISP is a Cable Modem connection and is configured for Dynamic IP Address (DHCP).
The Secondary ISP is a DSL connection with Static IP Addresses.
Due to an extended Cable Modem outage, our external IP Address on the Cable Modem connection changed. I now have a new IP Address to the ISP at that network adapter, which I can monitor using a packet sniffer and see using ipconfig. However, the TMG 2010 Port 53 packets are not being sent out the restored connection and TMG is not reverting back to that connection.
I went to the Forefront TMG Networking Menu and then clicked on the ISP Redundancy tab. I noticed that the properties of the Cable Modem connection still showed the old IP address. I modified the properties and entered the new IP Address and applied the changes. Still no port 53 test on the Cable Modem connection.
I then disabled and re-enabled the physical adapter in Microsoft Windows. Still no port 53 test.
What other items can be tried to get the TMG 2010 to revert back to the Cable Modem with this new IP Address? Restarting the server may be a fix, but I am trying to find a solution that will not require the interruption of the traffic on the Secondary ISP.
Thanks,
Brett Gibson
Gibson Teldata, Inc.
Brett Gibson