Event Type: Warning
Event Source: Windows SharePoint Services 3 Search
Event Category: Gatherer
Event ID: 2436
Description: The start address sts3://server:port/contentdbid={GUID} cannot be crawled.
Solution:
Some of the web applications didn't have a site collection on the default root sites. To check this browse to your web applications e.g. http://server:port. If you receive a HTTP 404 error you'll have to create a site collection for the web application.
To create a site collection browse to SharePoint Central Administration > Application Management > Create Site Collection and create a Blank team site for the appropriate web application.
This should sort out the consistent warnings in the event log.
