Getting EwsException while trying to fetch messages from Outlook

Hello. I’m trying to make BP start with new messages arriving in particular folder in mailbox., but each time a get this kind of exception:

Seems like it connects to the mailbox but unable to grab the messages for unknown reason. Maybe someone can enlighten me what could be the reason this exception is thrown?
I’m using the Exchange connector (version is microsoft Exchange 2010) for Outlook

We figured out that the problem was with my organization’s firewall, so case closed. If data in config is fine then everything will be alright