Symantec Endpoint Conflicting with FlexLM (AutoCAD) Licensing

Hi all,

I am having trouble with a rather strange issue. I talked to a symantec tech about this and he successfully crashed my entire network during work hours. (So much for paid support) Anyway the issue I am having is this.

We are an engineering office with about 250 employees. The main program we run is AutoCAD (Currently running 2008). We recently upgraded from Symantec Corporate 10.2 to Symantec Endpoint 11. There were some minor bug which have been worked out. The remaining issue it that AutoCAD will error out when attempting to retrieve a license from our licensing server. The licensing for AutoCAD is done through a 3rd party program called FlexLM. The way it works is that when a user opens a session of AutoCAD the FlexLM client goes and checks out a license from the Licensing server specified in a .lic file stored locally on the user's C:/ drive and holds it until the user closes the session.

The error we are getting is:

 "Your application was not able to obtain a license because the FLEXlm license manager could not determine where to find the licensing data it needs. Please choose one of the following:

Specify the License Server | Specify the License File"

If a user ether specifies the correct Licensing server OR hits cancel and opens again they are able to receive a license.

Now if Symantec Endpoint "network threat protection (firewall)" and "TruScan Proactive threat protection" are disabled and only antivirus/antispyware remain the problem disappears.

Now I have opened up every possible port I believe to be associated with the licensing per AutoCAD's website so I am fairly certain it is not a port issue.

Any ideas fellows?