Invalid length for a Base-64 char array

[Wayne Sepega]

I'm receiving the above error from time to time with one of our web pages.
What would cause this?
Thanks
Wayne

The following is the stacktrace from the exception:

System.Web.HttpUnhandledException: Exception of type
'System.Web.HttpUnhandledException' was thrown. ---> System.FormatException:
Invalid length for a Base-64 char array. at
System.Convert.FromBase64CharArray(Char[] inArray, Int32 offset, Int32
length) at System.Web.HttpServerUtility.UrlTokenDecode(String input) at
System.Web.UI.Page.DecryptString(String s) at
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack
trace --- at System.Web.UI.Page.HandleError(Exception e) at
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) at
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at
System.Web.UI.Page.ProcessRequest(HttpContext context) at
ASP.alerts_add_aspx.ProcessRequest(HttpContext context) at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously)

 

[Mark Rae]

I'm receiving the above error from time to time with one of our web pages.

Are you doing encryption / decryption...?

What would cause this?

I've seen this when trying to decrypt an unencrypted string...

 

[Wayne Sepega]

Yes we are, but looking at the stack trace it isn't getting into any of our
methods that do encryption/decryption.

Wayne