I had this problem for a while....
Go to ;
Settings / Control Panel / System and security / windows firewall / Advanced settings / inbound rules
Check that SWTOR is allow to receive transmissions.
Also make an exception for SWTOR in you outbound rules.
I gave it a go, I already had a couple inbound rules set for SWTOR but I had no outbound rules so I set a outbound rule for each of the inbound rules I had for it. Sadly this didn't work, thanks anyway.