I have gotten this a lot over the past several days....submitted a ticket on it after first couple of times and finally got this response:
I am Protocol Droid W2-O4 of Human-Cyborg Relations...
I have received your transmission regarding error 1003.
Normally, this means the server has gone down -- or been taken down for maintenance. It can also be related to firewall issues, so the usual 'check your firewall' instructions apply.
For some people, this happens without any firewall issue and while the server is demonstrably up. For those folks, there is a thread on this topic, and the actual root cause is still unknown. But for many people, setting the launcher to run in Windows XP SP3 compatibility mode seems to solve the problem as an interim workaround.
Please do not hesitate to contact us again if there is anything further we can help you with.
Galactic Support is our specialty...
Sincerely,
Protocol Droid W2-O4, aka Vin
Star Wars: The Old Republic Customer Service
Haven't tried it yet...but then I get different error codes (1002, 9000, 1003) every time I get DC'd and thrown back into queue.