Hiya...
Click on this link...
A Firewall Setup Help Guide
I know... I know... It's for a different client, but... The info available there is the most simple and straightforward guide that I know of to help you to quickly sort out your firewall setup problems...
On the 'connect' and 'Port' questions, click on the link
Port :6346 - Test If It Is 'Blocked'
in my 'sig' below...
And, you will also benefit from reading the information that you will find in the link
Alternate PORTS
That guide will explain to you what alternative ports should be the ones you consider
if it is necessary for you to use one other than 6346.
Hope it helps...