I did a quick search and found the following from here
208 is a communication error talking to either the manifest.swtor.com or the CDN-patch.swtor.com , if the issue is the CDN changing DNS server and flushing the DNS cache can sort it.
This can be local caused, but sometimes it can be a net routing issue, if on the net , sometimes rebooting the router/modem and if it changes IP address it will be gone as the issue will be tied to IP ranges.
Using a VPN like www.hotspotshield.com can also be used as a short term workaround if it is a routing issue.
Maybe also try using a wired connection instead of wireless if you are using that. Next step would be to try to do an IP Config Release / Renew to see if that clears it up. Also try disabling and then enabling your Ethernet / wireless card in your computer.
If your still experiencing issues, please attach a copy of your launcher logs found in the following directly:
C:\Program Files (x86)\Electronic Arts\BioWare\Star Wars - The Old Republic\logs
One thing i do know with nortons is that the exceptions for launcher.exe and swtor.exe needs to be set specifically to "allow" instead of "auto" has been known to auto block on occassion.
this may not be the cause but it is worth adjusting.
