SharePoint 2010 - Error in crawl logs on Gantt.aspx ....

Customer getting numerous errors in their SharePoint 2010 search crawl logs... all pointing to Gantt chart views...

Error message: The SharePoint item being crawled returned an error when attempting to download the item.

Solution:

1. Open Regedit on your search server.
2. Goto: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office Server\14.0\Search\Global\Gathering Manager
3. Change "UserAgent" from "MSIE 4.01" to "MSIE 8.0"
4. Restart server & kick off full crawl.

More Information:

Take a look at these blogs on updated User Agent Strings for IE...

https://blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx
https://blogs.msdn.com/b/ie/archive/2009/01/09/the-internet-explorer-8-user-agent-string-updated-edition.aspx