Wednesday, October 10, 2018

CiscoASA5505 - New WAN IP - Windows SBS DNS not working

Hello:

Today I had to install a new ISP into a Cisco 5505 for a remote office of ours...

Tunnel is up passing Phase1 and Phase2. I can SSH into the new external IP all looks good from a networking standpoint *I believe.

However DNS from a Windows SBS server is not working. It was not touched before this cutover so the only change was to the WAN IP on the 5505. We can ping 8.8.8.8 from the users PCs but unable to hit google.com etc.. We cannot ping 8.8.8.8 from the SBS server.

The SBS was setup with the DNS to point to itself inside its NIC then the forwarders were blank in the admin controls. Again nothing was changed other then the WAN IP on the firewall.

Any help guidance would be greatly appreciated.



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