Bitdefender And Domain Network Problem


i have a problem joining a windows server 2008 domain while bitdefender 2009 TS in active (firewall is ON). if i turn fw off, everything works, i am able to join domain using FQDN or netbios name. if i re-enable fw, i'm only able to join using netbios name, not fqdn. then if i add my domain controller into trusted zones, i'm able to join using fqdn but only for about a minute, after that time, the problem still persists.

let me say again, that everything is ok when firewall is off. you think bd is blocking specific port for fqdn or something?

any advice would be appreciated.