A common SharePoint 2007/2010 content source crawl error is the following:
"Access is denied. Verify that either the Default Content Access Account has access to this repository, or add a crawl rule to crawl this repository. If the repository being crawled is a SharePoint repository, verify that the account you are using has "Full Read" permissions on the SharePoint Web Application being crawled."
To address this you will likely need to disable the loopback check.
This error results from an authentication check that Windows performs to validate the local device name (i.e. server physical name). However since most of us use a FQDN for a SharePoint site (i.e. https://sharepoint...) the result is an error. You will need to disable this loopback functionality by making the following registry change.