The secure sockets layer (SSL) certificate sent by the server was invalid...
When you have your MOSS 2007 Web Applications configured for using SSL, there is a very big possibility you see this error in your Crawl Logs:
https://URL:port
The secure sockets layer (SSL) certificate sent by the server was invalid and this item will not be crawled.
So, does this mean you cannot crawl your SSL Web Applications? Well, sure it doesn't.
Solution:
Go to "Central Administration > Application Management > Manage Search Service"
Go to "Farm Level Search Settings"
Check the "Ignore SSL certificate name warnings" checkbox.
That does the trick, time to do some crawling...
Tom