ASP Net logoff issue

Question

Hello,

I am working in c# asp.net.

My page is geting logout as soon as any ostback events fires. For ex . : Dropdown selected event change, radio button event or button click.

I have already used EnableViewSate to TRUE on page directives , still it is getting loggedout.

Even i put thse controls in update panel and in Trigger.

Note : sometmes debugger goes in global.asax and it shows "Maximum length exceeded", so i change web config accordingly, still no luck

Pleae let me know any fix or feedback ?

Deepika Sawant · Answer

It looks like your issue is related to "Maximum request length exceeded" , which can cause unexpected logouts when postback events fire. Here are some possible fixes: 1. Increase maxRequestLength in web.config Your postback might be sending a large amount of data (e.g., ViewState, form data). Try increasing the request length in web.config : This increases the maximum request size to 32 MB . 2. Reduce ViewState Size Even though you set EnableViewState="true" , excessive ViewState can cause large postback sizes. Try disabling ViewState for unnecessary controls: 3. Check IIS Request Filtering If your application is hosted on IIS , you may need to adjust the maxAllowedContentLength setting: This increases the allowed request size to 30 MB . 4. Debug Global.asax Events Since your debugger enters Global.asax , check if Session_End or Application_Error is triggering a logout. You can log session expiration events: protected void Session_End(object sender, EventArgs e) { // Log session expiration System.Diagnostics.Debug.WriteLine("Session expired!"); } 5. Check Authentication Timeout If your authentication session is expiring too quickly, increase the timeout in web.config : This sets the session timeout to 60 minutes . 6. Use UpdatePanel Correctly If you're using an UpdatePanel , ensure that triggers are correctly set: Try these fixes one by one and see if your issue is resolved. If the logout still happens, check event logs in IIS or Global.asax for unexpected session expirations.

ASP Net logoff issue

Answers (1)