We've had SmarterTicket deployed successfully for months now and, suddenly, when we try to login, the whole thing crashes (see error below). The errortalks about being in a web farm or cluster, which it is not - it is simply on a shared server. We made no changes to the software prior to this starting.
Server Error in '/' Application.
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:
The source code that generated this unhandled exception can only be
shown when compiled in debug mode. To enable this, please follow one of
the below steps, then request the URL:
1. Add a "Debug=true" directive at the top of the file that generated the error. Example:
<%@ Page Language="C#" Debug="true" %>
or:
2) Add the following section to the configuration file of your application:
<configuration>
<system.web>
<compilation debug="true"/>
</system.web>
</configuration>
Note that this second technique will cause all files within a given
application to be compiled in debug mode. The first technique will
cause only that particular file to be compiled in debug mode.
Important:
Running applications in debug mode does incur a memory/performance
overhead. You should make sure that an application has debugging
disabled before deploying into production scenario.
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Stack Trace:
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[ buf, Byte[ modifier, Int32 start, Int32 length, Int32& dataLength) +294
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +203
[ViewStateException: Invalid viewstate.
Client IP: 68.200.121.84
Port: 4786
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
ViewState: /wEPDwUKLTY5MDU1NTkzMg8WBB4QX19fUmVzdWx0RmFpbHVyZWUeEF9fX1Jlc3VsdFN1Y2Nlc3NlFgJmD2QWAgIBD2QWBgIDDxYCHgRUZXh0BRVWZW5kb3IgQ2hlY2tzIFN1cHBvcnRkAgQPZBYCAgMPEGQQFQEMRW5nbGlzaCAoZW4pFQECZW4UKwMBZ2RkAgUPZBYGAgMPDxYCHgdWaXNpYmxlaGRkAgUPDxYCHwNoZGQCBw8PFgIfA2hkZBgBBR5fX0NvbnRyb2xzUmVxdWlyZVBvc3RCYWNrS2V5X18WAQUeY3RsMDAkTVBIJEN1c3RvbWVyTG9naW4xJGN0bDAyuePOmH0G5u6J+Dk5DzvEpEptW48=
Referer: http://support.fadv-vendorcheck.com/Main/Default.aspx
Path: /Main/Default.aspx]
[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) +267
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +282
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() +198
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +83
System.Web.UI.Page.LoadAllState() +35
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7350
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +213
System.Web.UI.Page.ProcessRequest() +86
System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +18
System.Web.UI.Page.ProcessRequest(HttpContext context) +49
ASP.main_default_aspx.ProcessRequest(HttpContext context) +4
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +358
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64
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Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433