Hi,
I am having a problem which is :
I have a asp.net project running on our webserver. It worked ok till
sometime back.
Sometimeback, we installed a cisco CSS box ( for loadsharing) between
the primary webserver, and the secondary servers.
After that, I found that my asp.net page would randomly give the error
message -
Unable to validate data' - most of the time on a postback to the server
( for the detailed error message - see below)
I have been very much assured that the CSS box does LOADSHARING WITH
STICKY SESSIONS - (ie) once you open a browser, it does not switch to a
different server ( on the same browser). So, this scenario is different
from a webfarm ( where it can postback to a different server each
time).
Assuming there is no posting back to a different server ( no webfarm
scenario) - I cannot change the machine.config file - because I have
been advised not to. I have read articles which advise me to have the
same validation key across all servers ( in a webfarm scenario) - but
there is no way I can suggest this unless I have valid 'PROOF' that
that is indeed the case. How can I figure out the cause / ( OR if for
some reason - it is doing post back to a different server in the same
browser - 'PROVE' that that is actually the case?
Is there ANYTHING I can do to fix this. I am not sure what could be
causing it- just that it may have something to do with loadsharing and
it happens on a Page Postback.
Someone, Please HELP !!!!!
( More details on the error message):
************************************************** ****************
Server Error in '/IAMI/ASP' Application.
--------------------------------------------------------------------------------
Unable to validate data.
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: Unable to validate data.
Source Error:
An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60
[HttpException (0x80004005): Authentication of viewstate failed. 1) If
this is a cluster, edit <machineKey> configuration so all servers use
the same validationKey and validation algorithm. AutoGenerate cannot
be used in a cluster. 2) Viewstate can only be posted back to the same
page. 3) The viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +118
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +101
[HttpException (0x80004005): Invalid_Viewstate
Client IP: 71.106.192.225
Port: 50337
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;
..NET CLR 1.1.4322)
ViewState:
dDwtMTk3MTk2NzkxNDs7bDxpbWdCdHRuR287Pj7EvfWvT/kVHfVpBzqoNveglMw/rg==
Http-Referer:
http://infosec.upmc.com/IAMI/ASP/ISG...04343333DFAF.]
Path: /IAMI/ASP/ISG_IMS_RequestProcessing.aspx
System.Web.UI.Page.LoadPageStateFromPersistenceMed ium() +442
System.Web.UI.Page.LoadPageViewState() +18
System.Web.UI.Page.ProcessRequestMain() +441
************************************************** ****************
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