Connection Issues on WhatsApp

Greetings, I have just installed the Bitdefender. My WhatsApp was working fine before, but after the installation of Bitdefender completed and I started using it my whatsapp suddenly lost itit's connectivity and displays message that you have no connection even thou there is. I tried uninstalling and reinstalling whatsaap but it didn't change any thing. So I deactivate the firewall and after several minutes my WhatsApp start working again. I have to turn off firewall each time when i want to use WhatApp. I have tried changing network type to home, but nothing works. Even if firewall is off, sometimes it take 5 to 10 minutes to establish the connection.

I would like to know if there is any way to solve the problem, because it is nor safe neither convenient to disable firewall again and again. Also that waiting time is too much.