unable to validate data

[Mike Fellows]

running IIS on a single server, hosting pages on an intranet basis,
one single user out of 50 is having an unable to validate data issue
how do i fix this (the microsoft KB is a little inconclusive) ?

cheers

mark

this is the error message

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) +196

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.LoadPageStateFromPersistenceMedium() +102



[HttpException (0x80004005): Invalid_Viewstate

Client IP: 192.168.0.21

Port: 1109

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;
..NET CLR 1.1.4322; .NET CLR 2.0.50727)

ViewState:
dDwtMTM3MjY4MTQzNTt0PDtsPGk8MT47PjtsPHQ8O2w8aTw1PjtpPDEwPjtpPDExPjs+O2w8dDxAMDxwPHA8bDxQYWdlQ291bnQ7XyFJdGVtQ291bnQ7XyFEYXRhU291cmNlSXRlbUNvdW50O0RhdGFLZXlzOz47bDxpPDE+O2k8MD47aTwwPjtsPD47Pj47Pjs7Ozs7Ozs7Ozs+Ozs+O3Q8cDxwPGw8VGV4dDs+O2w8NS8yNi8yMDA1LS0tLS0tLS0tNi8yLzIwMDU7Pj47Pjs7Pjt0PHA8cDxsPFRleHQ7PjtsPEplbm5hIEtlbm5lZHk7Pj47Pjs7Pjs+Pjs+Pjs+Y5qdRv2F2k73KF7fQjKP5EMZbcw=

Http-Referer: http://**********/

Path: /**************.]

System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +448

System.Web.UI.Page.LoadPageViewState() +18

System.Web.UI.Page.ProcessRequestMain() +447

 

[Guest]

I have also run into similar issue on our app. most of the time the culprit
is presence of a proxy server or a cache server intercepting the
request/response and chopping off the view state if its too big. Check if
these users have components like WebTv or Google accelrator.

 

[Mike Fellows]

I have also run into similar issue on our app. most of the time the culprit
is presence of a proxy server or a cache server intercepting the
request/response and chopping off the view state if its too big. Check if
these users have components like WebTv or Google accelrator.

:

nothing like that on the users machine, we do have IIS server but its
bypassed for local sites,
just seems weird that its on one machine - it follows the users profile
around as well - so if the user
logs onto another machine - the problem surfaces - might be the cache in the
users profile - will try to clear that

 

[Mike Fellows]

sorry meant ISA server

nothing like that on the users machine, we do have IIS server but its
bypassed for local sites,
just seems weird that its on one machine - it follows the users profile
around as well - so if the user
logs onto another machine - the problem surfaces - might be the cache in
the users profile - will try to clear that

 

[Guest]

Any resolution to this?