Windows event application log error 'Viewstate verification failed. Reason: The viewstate supplied failed integrity check'


SYMPTOMS

The Windows event log is reporting ASP.NET errors containing the following error viewstate error:

Log Name: Application

Source: ASP.NET 4.0.30319.0

Date: 02/02/2017 15:15:07

Event ID: 1316

Task Category: Web Event

Level: Information

Keywords: Classic

User: N/A

Computer: MAIL

Description:

Event code: 4009

Event message: Viewstate verification failed. Reason: The viewstate supplied failed integrity check.

Event time: 02/02/2017 15:15:07

Event time (UTC): 02/02/2017 15:15:07

CAUSE

The viewstate errors can occur if the MailEnable application pool is recycled and causes the client to lose session. It also commonly occur if the client times out before the servers website session timeout value. More information can be found within the following Microsoft article: https://support.microsoft.com/en-us/help/2915218/resolving-view-state-message-authentication-code-mac-errors

MORE INFORMATION

Setting the timeout for web mail sessions: http://www.mailenable.com/kb/content/article.asp?ID=ME020120



Product:MailEnable (All Versions)
Article:ME020657
Module:WebMail
Keywords:viewstate,asp.net,session,timeout,web,mail
Class:ERR: Product Error
Revised:Friday, February 3, 2017
Author:
Publisher:MailEnable