Since update to Bitdefender 2018 Firewall blocks NFS Server

Hello

Since the update to version 2018 the Firewall blocks me my NFS Server and portmapper. Support since 2 weeks (!!) isn't able to resolve this problem. Version 2017 worked perfect. If I switch of the Firewall off, the Windows Firewall takes over and it works perfectly (the relevant ports and programs are registered same as in Bitdefender!!), but Bitdefender is switching his Firewall again and again on. As support is obviously not able to resolve the problem I would prefer to switch the Firewall permanently. How can I do this?

Thanks for any help.

Heinz