While working with SharePoint, I got an error in search
service when I try to index a page having search results using for roll the
content in site collection. My search service application and content source
are working fine. After checking this error in logs and digging in to this
error I found that we have to change User agent value.
To do that,
Open Registry editor (Run -> regedit) and navigate to “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office
Server\14.0\Search\Global\Gathering Manager” key.
Change the value of “User Agent” from “MSIE 4.01” to “MSIS
8.0” and restart SharePoint search service.