Items are being deleted from the index and are not retrievable from the main default.aspx page search bar

Issue Definition:

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1)      Users are unable to retrieve items from the index they could previously.

2)      Items are being deleted from the index and are not retrievable from the main default.aspx page search bar.

RESOLUTION:

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As part of troubleshooting, I did following steps.

1)      We run psconfig.exe on application server.

2)      Need to check Disable loopback check is setup or not on server. Went to registry and found that it is already there.

3)      Specify host names: To specify the host names that are mapped to the loopback address and can connect to Web sites. This method would be preferred for NTLM authentications.

· Click Start, click Run, type regedit, and then click OK.
· In Registry Editor, locate and then click the following registry key:
· HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0
· Right-click MSV1_0, point to New, and then click Multi-String Value.
· Type BackConnectionHostNames, and then press ENTER.
· Right-click BackConnectionHostNames, and then click Modify.
· In the Value data box, type the host name or the host names for the sites that are on the local computer, and then click OK.
· Quit Registry Editor, and then restart the IISAdmin Service

In the above step, I specified all host names and tried to start crawling. No use.

2)            In technet blog, I found that if any patches effected on SharePoint services, we need to recreate and enter value for disablleloopback check in registry entry.

3)            Mentioned admin account for Search Service application administrators in central admin.

4)            Administrators for user profiles service application:  Here we will mention users who will be able to manage settings related to UPS and search content. Checked admin account rights for UPS and found admin account is not having Retrieve people data for search crawlers. Checked that permissions for admin account.