Redirect to Login Form automatically

Hi,
        Set the authorization after authentication in your web.config


Regards,
Iftikar

I think you config file is okay. coz if there is any problem in config file. autematically logout will happen always not in particular time.
Write log file in all catch block. if it occurs from any exception .you can easily find with this log file.

My Web.Config code

xml version="1.0"?>

<configuration>

<configSections>

<section name="dataConfiguration" type="Data.DataConfiguration,Data"/>

configSections>

<dataConfiguration defaultDatabase="SampleDatabase"/>

<connectionStrings>

<remove name="SampleDatabase"/>

<add name="SampleDatabase" connectionString="Data Source=Nilesh;Initial Catalog=Smaple;Integrated Security=True" providerName="System.Data.SqlClient"/>

connectionStrings>

<system.webServer>

<security>

<requestFiltering>

<requestLimits maxAllowedContentLength="500000000">requestLimits>                                                              

requestFiltering>

security>

system.webServer>

<system.web>

<httpRuntime executionTimeout="4800" maxRequestLength="500000000"/>

<compilation debug="true" targetFramework="4.0" />

<customErrors mode="Off"/>

<authentication mode="Forms">

<forms loginUrl="~/Login.aspx" timeout="2880" />

authentication>

<sessionState timeout="2880">sessionState>

<membership>

<providers>

<clear/>

<add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices"  enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />

providers>

membership>

<profile>

<providers>

<clear/>

<add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>

providers>

profile>

<roleManager enabled="false">

<providers>

<clear/>

<add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />

<add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />

providers>

roleManager>

system.web>

<system.webServer>

<modules runAllManagedModulesForAllRequests="true"/>

system.webServer>

configuration>

I think it happens due to session expiration. [20 Minut(Default time)] .
If this is happening becoz of session you have to manage a session expiry page.when you session expires you redirect to your session expiry page.

If this is happening due to any error or any exception i suggest you to use exception logger.

Share you code .I want to know that how u manage a login? and which authentication you are using?