An error occurred in the web application: Server cannot set content type after HTTP headers have been sent.

[admin_9072]

Proget Version 4.6.7 (Build 2)

Message: An error occurred in the web application: Server cannot set content type after HTTP headers have been sent.

Details: URL: http://proget.passeidireto.com/log-in?ReturnUrl=%2F
Referrer: http://proget.passeidireto.com/log-in?ReturnUrl=%2F
User: Anonymous
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36
Stack trace: at System.Web.HttpResponse.set_ContentType(String value)
at Inedo.Web.PageFree.SimplePageBase.<ProcessRequestAsync>d__48.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.TaskAsyncHelper.EndTask(IAsyncResult ar)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

services ok.. no hardware problems..

[atripp]

That message is basically a result of a bug in error-handling logic; basically, an error is occurring while displaying the error. This can happen due to certain IIS or server settings, and in later version, you should see a more appropriate message.

It's hard to say what the problem is, but if you didn't change anything, I would just reboot, and the problem might go away. Changing App Pool settings can also help (like Classic -> Integrated or viceversa).

You can also try upgrading to see the underlying message. v4.6 is pretty old anyways.