I wasn't sure if this was the right section, but I installed MTA:SA today with no problem, but when I try to "Browse Servers", it tries to connect to the Master Server List for a short time, then gives "Master Server List could not be retrieved", at the little bar on the bottom of the server window/box. I had this problem with all of the nightly builds too.
Using Quick Connect simply shows "Connection Timed Out" every time.
I don't have any firewalls active as far as I am aware.
I'm on a desktop pc and connect wireless-ly to a NETGEAR ADSL2+ Modem Router DG834G