When starting the full crawl of the default content which includes HTTPS sites, I received the error:
"The secure sockets layer (SSL) certificate sent by the server was invalid and this item will not be crawled."
Go to "Central Administration > Application Management > Manage Search Service > and click on
Farm Level Search Settings.
Scroll to the bottom of the page, under the SSL Certificate Warning Configuration section, select the "Ignore SSL certificate name warnings" and click OK.
Same can be done by clicking "Proxy and timeouts" link in Search Administration of SSP.
For SharePoint 2010: http://technet.microsoft.com/en-us/library/ee792873.aspx
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