Server Error in '/' Application. Operation is not valid due to the current state of the object

Buenas chic@s,

Al entrar a una intranet (tengo un W10) me aparece el siguiente error:

Server Error in '/' Application.

Operation is not valid due to the current state of the object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.


Exception Details: System.InvalidOperationException: Operation is not valid due to the current state of the object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[InvalidOperationException: Operation is not valid due to the current state of the object.]
Microsoft.SharePoint.IdentityModel.Pages.FormsSignInPage.GetSecurityToken(Login formsSignInControl) +1256
Microsoft.SharePoint.IdentityModel.Pages.FormsSignInPage.AuthenticateEventHandler(Object sender, AuthenticateEventArgs formAuthenticateEventArgs) +377
System.Web.UI.WebControls.Login.AttemptLogin() +166
System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e) +81
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +52
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3602


Curiosamente hace 2 semanas podia y esta semana lo he intentado ( y con diferentes navegadores ) y no puedo entrar.

¿sabeis a que puede deberse?

Muchas gracias de antemano
 
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