Lets try this with an simple example. Just leave you SharePoint page idle for more than 30 mins. what will happen if you try to refresh the page, yeah you are 100% correct, you will be greeted with error message "the security validation for this page has timed out".
How to resolve this? This is n't a rocket science folks. It is very simple by changing the settings in Central Administration.
Steps
- Open Central Admin
- Navigate to the Mange Web Application under Application Tab.
- Select the web application name
- Go to the General settings
- Change the value in Web Page Security Validation to 60 mins. By default the value is 30 mins.