Authorize.net connection timeout

[bubba64]

All had been working well with our site, but beginning on 12/1/11 customers are unable to checkout (everything had been fine for over a year). Now when checking out, customers get a java.net.ConnectException Connection Timeout and their credit cards are never processed.

I am able to login to authorize.net from a web browser and go into my account no problem. Any idea why this problem would 'all of the sudden' begin occurring???

Thanks!