A couple of us have started to see a fatal error creep in to performing some secure HTTP requests.
The error message "A connection failure occurred: SSL problem (possibly a bad/expired/self-signed certificate, clock set to wrong date)" has also been mentioned in a recent commit to the ASIHTTPRequest tree :
The version used by Titanium is : v1.8.1-8 2011-06-05
The latest version from ASI is : v1.8.1-61 2011-09-19 (as stated in the ASIHTTPRequest.m file)
Please, this needs to be updated uregntly. The bug appears to have crept in via a recent iOS update and can only get worse if not fixed urgently. Especially given the impending WWDC.