Just in case you haven't seen it on the 'official' EQ2 forums.
There appears to be a problem going on atm with people trying to log into EQ2. They are getting 'timeouts' and 'invalid password' errors. This issue also appears to extend to EQ1 and Vanguard. I know it for a fact with EQ1 and EQ2 as well as the SOE forums.
It appears to have something to do with the registration servers, as multiple account holders are able to sign in on their other accounts, just not the first one they chose to use today. I've tested this (I have 2 accounts) and sure enough, my main cannot sign in, but my secondary can. Both have the same passowrd, just rearranged and EXACTLY the same billing information.
The problem here is that SOE Tech Services aren't open today... hopefully there's a tech wandering around the building though and will spot it.