ACT Remote database not syncing

We recently upgraded our ACT to Premium Web Version 17 (from 2012).

It all works fine on the web server.
But when our users who run the software installed on thier computers and access it through remote databases try and connect they get the error message:

"Act! is unable to connect to the sync server.  Check to be sure "accept incoming sync" in enabled in the main database and that the Network sync service is running.  Also be sure you are connected to your network.  Contact your administrator for assistance.

I have tried it with accept incoming sync on.
And with Network sync on (they both can't be on at the same time) and no dice.

It worked fine syncing with our ACT 2012 any ideas?
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Mike LazarusAct! Evangelist - CRM ConsultantCommented:
Could it be blocked by a firewall?
Is the server name the same?
Did you upgrade the Sync Service also?

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