Interent access via WatchGuard after Server Change

I am in the process of changing out a file server.  It is the only server on the network.
Access to the internet is through a WatchGuard XM25 appliance
The Domain name is the same, but the DNS has changed.  The WatchGuard provided internet connection for a few minutes, and now there is no internet connection.  I can remote into the network with the WatchGuard SSL-VPN utility, and access the computers.  

Any thoughts on why I cannot access the internet from behind the WatchGuard Appliance?

The old server was 2008R2 and the new server is 2016Standard
WilfAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Dirk KotteSECommented:
do the whatchguard use the internal DNS as forwarder?
so if you remove one (old) DNS server the Whatchguard is unable to resolve names for Proxy/scannig/contentfiltering after DNS cache is timed out.
WilfAuthor Commented:
That seems to be what is happening.  Unfortunately the watchguard appliance failed.  I am in the process of installing another appliance.

Will see how that one goes
WilfAuthor Commented:
On a new installation, how would one get the watchguard to resolve the first time.
WilfAuthor Commented:
I thank you for your time, but unfortunately an incorrect DNS server entry was the culprit.  The server had first been put in service in a test environment, and the DNS of the test environment did not clear when the number was changed for the in service environmnet

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Networking

From novice to tech pro — start learning today.