People search not working

When they try to do people search from their site http://server1 they do not get any results.

Cause:

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There was an user added to the UPA Administrators group which was deleted from AD. Later when we tried to add the default content access account to the UPA Administrators we used to get an error stating cannot find user. Additionally, the crawl rule was not taking in effect and was crawling using spssearch account.

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Resolution:

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Removed the problematic user from the UPA Administrators.

Added the default content access account user to the UPA Administrators with permission to retrieve and crawl people data.

Removed the crawl rule.

Tried crawl, it was successful. The issue is resolved.