Validation of viewstate MAC failed.

[Guest Sean M. Severson]

I'm working on my first load testing scenario for an ASP.NET application and have created several profiles. I'm testing my profiles one-by-one and am ecountering the following error.

 

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. ---> System.Web.UI.ViewStateException: Invalid viewstate.

 

There was a thread on this back in 2008, but I did not see a resolution at that time.

 

I am running a single user for a single profile. The profile loops for 5 minutes and lands on 4 different pages. I have attached the Scenario and the profile in question. I have tried entering enableViewStateValidation = "false" into the web.config files as recommended in some other threads, but this does not help.

 

We are not running a Web Farm. I do not receive these errors when I run the application manually. I am using the think times generated individually for each request via the record process.

 

I am using WAPT 6.0 Built on Sep 9, 2009.

 

Thanks for your help.

 

Sean M. Severson

Performance_Measurements.wps

PAL_Exact_Claim_Search.wpp

[sergei 0]

Could you give me a log file or send it to support@loadtestingtool.com?

[Guest Sean M. Severson]

Sergei,

 

Your question about the log file prompted me to look at this feature (which I had not reviewed before). I discovered that I was getting errors about not being authorized to view pages. I'll use the logs to try to resolve this issue. If I still need assistance, I will post another entry to this thread.

 

Thanks for your help.

 

Sean M. Severson

[Guest Sean M. Severson]

Sergei,

 

I have attached a log file. Even after looking through the log file, I was unable to determine other steps to take. So, I am still receiving the following error from my asp.net application.

 

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. ---> System.Web.UI.ViewStateException: Invalid viewstate.

 

Thanks for your help.

 

Sean M. Severson

4_000_0.zip

[sergei 0]

I think your profile has a wrong parametrization or some requests are missing.

I see following error message in the most of responses:

The application has experienced an error. Please contact your system administrator if this problem persists.

[Guest Sean M. Severson]

Sergei,

 

Yes, some of the paramters in my profiles were messed up. I have corrected this and all but one of my profiles are now running without error. The error I am receiving is in our code, but only occurs when I run the load test, not when I manually perform the same activities through our application. This may also be due to an incorrect paramter. I'm still working in this one.

 

Thanks,

 

Sean M. Severson

[Guest Sean M. Severson]

Sergei,

 

One of the aspx pages I am testing creates a new record, generates a new id for that record, and displays the record on the form. I then add some information into the form and save the record. How does WAPT handle the generation of the id? It looks like it is attempting to use a variable in place of the actual value. Can I use the value that is generated by my code and actually placed in the control on my form?

 

Sean M. Severson

[sergei 0]

You should find the id in a server reply, store it in a variable and then use the variable value in the form submit request.