This isn't an MC problem.
No its not. Just mentioning B.D. ....
I use Bitdefender because I bought a three year contract, then I'm changing
. They are notorious about false positives with jriver; however their firewall is pretty good and easy to set up. You have to white-list the program other wise each install you must "allow" both the MC server program and the main jriver app after each version change. In their defense, their firewall is doing what it should do I guess
Occasional I have had to exclude a new install, and that's more of a pain in the ass ... but it hasn't happened in awhile knock on wood. Do not use both Windows and Bitdefender firewalls at the same time though.