Bitdefender block my wifi hotspot, same issue described here :
I tried the solution, it worked, but since a month or so I have to disable the Bitdefender's firewall in order to connect my phone. Once it's connected, I can enable it again without losing the connection.
Here are the rules which I copied from the post above and does not work any more for me 
    
        
             
    
Here is my network card settings  : 
    
        
            