asp.net Forms authentication expires before timeout with a error

My application is hosted on a shared hosting plan so I don't have to much access to logs or settings, but if I'll be able to tell what cause's the problem I could ask the hosting company to fix it.

This is the error I get:

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

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.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Source Error:

[No relevant source lines]


Source File: c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\admin\4abedb3d\bfad2684\App_Web_xmkh49pj.0.cs    Line: 0

Stack Trace:

[HttpException (0x80004005): Unable to validate data.]
   System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +289
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +140

[ViewStateException: Invalid viewstate.
      Client IP: 66.128.11.20
      Port: 12865
      User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6.5; Avant Browser; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; WinNT-PAI 21.07.2009)
      ViewState: /wEPDwULLTE1MDYzMzkwMDQPZBYCZg9kFgICAw9kFgYCAQ9kFgZmDw8WAh4EVGV4dAUaRnJpZGF5LCBTZXB0ZW1iZXIgMDMsIDIwMTBkZAIBDxBkZBYBZmQCCg8PFgIfAAUoV2VsY29tZSA8Zm9udCBjb2xvcj0jOTkwMzAzPmFkbWluPC9mb250PmRkAgMPZBYCAgEPDxYCHgdWaXNpYmxlZ2RkAgUPZBYGAgEPZBYCAgEPDxYCHwAFEU9yZGVyIFN0YXR1czogTmV3ZGQCAw8PFgIfAWhkZAIFD2QWAmYPZBYEAgEPZBYCZg9kFgICAQ8WAh4LXyFJdGVtQ291bnQCAhYEZg9kFgJmDxUCEkluZGV4LmFzcHg/aWQ9aG9tZQRIb21lZAICD2QWAmYPFQImSW5kZXguYXNweD9pZD1vcmRlcnMmc3RhdHVzPU5ldyZzdGF0PTEGT3JkZXJzZAIDDzwrAAsBAA8WCh8CAggeCERhdGFLZXlzFggCu6MBAsejAQL3owECm6QBArOkAQLLpAEC16QBAuOkAR4JUGFnZUNvdW50AgIeFV8hRGF0YVNvdXJjZUl0ZW1Db3VudAISHhBDdXJyZW50UGFnZUluZGV4AgFkFgJmD2QWEAICD2QWDGYPZBYCZg8VAQUyMDkyM2QCAQ8PFgIfAAULUmVnaW5hIENoYW5kZAICD2QWAmYPFQEJOC8yOS8yMDEwZAIDD2QWAmYPFQEHJDg5Ni43OWQCBA9kFgJmDw8WAh4LTmF2aWdhdGVVcmwFFWphdmFzY3JpcH...]

[HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.]
   System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +106
   System.Web.UI.ViewStateException.ThrowMacValidationError(Exception inner, String persistedState) +14
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +242
   System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +4
   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +37
   System.Web.UI.HiddenFieldPageStatePersister.Load() +207
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +105
   System.Web.UI.Page.LoadAllState() +43
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6785
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +242
   System.Web.UI.Page.ProcessRequest() +80
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
   System.Web.UI.Page.ProcessRequest(HttpContext context) +49
   ASP.index_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\admin\4abedb3d\bfad2684\App_Web_xmkh49pj.0.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
Mr_EziAsked:
Who is Participating?
 
richard_hughesConnect With a Mentor Commented:
Hello

Have a look here:

http://forums.asp.net/t/1166634.aspx

You may need to find out what your hosted machine key is from the hosting company if you can.

Thanks
0
 
richard_hughesCommented:
Hello Mr_Ezi

Do you have access to IIS at all?

Thanks,

Richard Hughes
0
 
Mr_EziAuthor Commented:
No I don't have access to the iis settings.
0
 
Mr_EziAuthor Commented:
I don't need to know the machine key from the company, there are online key generetors out there that did the job just fine.

Thanks
0
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