Technical difficulties this morning once again forced Comic-Con International organizers to close online membership sales. Their site currently reads:

REGISTRATION IS CLOSED!

Once more, unfortunately, there have been issues with Comic-Con registration. So we have again decided to close it down.

We are well aware that many people have taken time from work, school or other activities and others woke up very early. There really is no way to convey our level of regret for this turn of events.

We are currently researching our registration options.

Based on the first response in the comments thread of Comics A.M. from earlier this morning, it looks like the servers crashed sometime before 6:24 a.m. Pacific, not even a half hour after going on sale at 6 a.m. Kiel has comments from CCI's David Glanzer over on CBR.

Update: A commenter notes that the server never appeared to be up this morning at all.