With this post, I'm going to start a series on problems I have encountered with SharePoint search.
Error: The start address sps3://luapp105 cannot be crawled.
Context: Application 'Search_Service_Application', Catalog 'Portal_Content'
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. (0x80041205)
(Event ID: 14, Task Category: Gatherer)
Solution: give appropriate permissions to User Profile Synchronisation Service