F5 load balancer and session time out for asp.net page when page post back

i deployed asp.net application in two asp.net servers and users access this application through F5 Load balance. here we facing issue when user was idle on asp.net page for 10 min , and after when user click the button on page, and page can not be displayed message appers in IE,

and in firefox below message The connection to the server was reset while the page was loading. In IIS default session timeout value is 20 Min

In F5 TcpIP time out value :10 Min