Asp.net Session timeout

Question

Hi, I want to make session timeout for atleast 45mins, what I'm doing is mentioned below with referrence link

 

<configuration>
     <system.web>
        <sessionState timeout="20"></sessionState>
     </system.web>
   </configuration>

Ref Link: https://stackoverflow.com/questions/1205828/how-to-set-session-timeout-in-web-config 

 

I deployed my application on Plesk server, but session timeout is not working for me, In IIS it is just to set some settings in IIS and its done.

Thanks in advance