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Asked: 2026-05-11T09:50:16+00:00

Background: I developed a web app in ASP.Net 3.5 in C#. It runs great

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Background: I developed a web app in ASP.Net 3.5 in C#. It runs great but now a few users have reported that they recieve an error sometimes. I have tried to duplicate the error but it has been hard. One time though when I let the app sit I came back later and tried to move it along and it errored out. I would think that has something to do with the timeout but I am using the view state.

Any ideas? When I look at the eventLog I do see the following error entry.

Thank You for your help and ideas!

John

My event log has the following errors:

Event code: 4005

Event message: Forms authentication failed for the request. Reason: The ticket supplied has expired.

Event time: 14/03/2008 13:19:26

Event time (UTC): 14/03/2008 13:19:26

Event ID: d9f0333c2eed46e0b0207da69d2ea70e

Event sequence: 154

Event occurrence: 5

Event detail code: 50202

Event code: 3005

Event message: An unhandled exception has occurred.

Event time: 3/12/2009 7:49:59 AM

Event time (UTC): 3/12/2009 11:49:59 AM

Event ID: 590ac0f6ad734d988e9e02f0fb7800eb

Event sequence: 52

Event occurrence: 1

Event detail code: 0

Application information: 

Application domain: /LM/W3SVC/32/ROOT-1-128813294498061103   Trust level: Full   Application Virtual Path: /   Application Path: C:\Home\LocalUser\ucpga\Web\   Machine name: 169349-WEB2

Process information: 

Process ID: 6912   Process name: w3wp.exe   Account name: NT AUTHORITY\NETWORK SERVICE

Here is the latest error:

Event code: 4009 Event message: Viewstate verification failed. Reason: The viewstate supplied failed integrity check. Event time: 3/15/2009 10:26:27 PM Event time (UTC): 3/16/2009 2:26:27 AM Event ID: 3b5be134005e49c3b40400bcaa5cb48d Event sequence: 56 Event occurrence: 1 Event detail code: 50203

Application information: Application domain: /LM/W3SVC/32/ROOT-1-128816433841748972 Trust level: Full Application Virtual Path: / Application Path: C:\Home\LocalUser\ucpga\Web\ Machine name: 169349-WEB2

Process information: Process ID: 8892 Process name: w3wp.exe Account name: NT AUTHORITY\NETWORK SERVICE

Request information: Request URL: https://hr.ucpga.org:443/application.aspx Request path: /application.aspx User host address: 74.160.64.222 User:
Is authenticated: False Authentication Type:
Thread account name: 169349-WEB2\ucpga

ViewStateException information: Exception message: Invalid viewstate. Client IP: 74.160.64.222 Port: 1251 User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB5; .NET CLR 1.1.4322; InfoPath.1)

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  1. This issue can often be caused by having auto-generated <machineKey /> keys in your server’s machine.config file. Each time your application starts afresh it will generate new keys. This invalidates any existing encrypted viewstate or forms authentication tickets.

    Try setting the <machineKey /> validationKey and decryptionKey to fixed values. See the following link for more information:

    How To: Configure MachineKey in ASP.NET 2.0 (MSDN)

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