Thank You for the comments. Version of Kentico is 7 and site is live. Below is the event log
EventTime: 10/31/2017 9:31:56 PM
DocumentName: Search Results
EventDescription: Message: Request timed out.
Site: Sharjah Museums Authority_SMA
EventUserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36
Even when I click on Smart search from Sitemanager/Administration I get below error. Please advice
Server Error in '/' Application.
Request timed out.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: Request timed out.
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
[HttpException (0x80004005): Request timed out.]
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1031