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"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. "

I've been getting the above error periodically when I've left my computer
for 30+ minutes and return and navigate to another page on the same site.
AS.NET VB.NET code.

I am using shared hosting at www.serverintellect.com

What's the best solution to remedy this?

See if this helps:

http://www.sosuke.com/index.php/2009...te-mac-failed/

--
Eliyahu Goldin,
Software Developer
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin


"Mark B" <> wrote in message
news:%...
> "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. "
>
> I've been getting the above error periodically when I've left my computer
> for 30+ minutes and return and navigate to another page on the same site.
> AS.NET VB.NET code.
>
> I am using shared hosting at www.serverintellect.com
>
> What's the best solution to remedy this?
>
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus
> signature database 4263 (20090721) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>
>


__________ Information from ESET NOD32 Antivirus, version of virus signature database 4263 (20090721) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

On Jul 21, 12:04*pm, "Mark B" <none...@none.com> wrote:
> "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. "
>
> I've been getting the above error periodically when I've left my computer
> for 30+ minutes and return and navigate to another page on the same site.
> AS.NET VB.NET code.
>
> I am using shared hosting atwww.serverintellect.com
>
> What's the best solution to remedy this?

used in web.comfig file
<System.web>
<pages enableViewStateMac="false">
then it's work fine