Debug validation of viewstate mac failed

I tried all the solutions given. Is it a large page? Maybe the PDA has a limit for how much data it will download and cuts off the viewstate. I have meta refresh tag on the page which refreshes the page every 20 seconds. First time when the page is loaded on the PDA it refreshes without any issues. After he submits that page he is redirected to the first page with th erefresh meta tag. First page with Refresh meta tag load and when the refresh is happening it throws this error. I hpe I was able to explain the issue. Appreciate your help on this.

If you are on a PDA and refreshing every 20 seconds, do you need viewstate? Could you turn that off? Are there controls which you want to keep their state between refreshes? All that because someone decided it would be best…. Write html ; in your code?

Solution 1

I have removed the view state from the page. The issues that I was facing earlier is gone. But now if the user click on teh back button a couple of times he gets this error "Validation of viewstate MAC failed error" Thsi does not happen on the workstation. The easiest way to track something like that down is if you can reproduce it and then get a network trace to see what is being passed back and forth from the server to the client and vice versa. It depends of if you consider changes to your config files changes.

One other thing that can cause errors like this is if there is a second form tag on the page. So make sure there is just the one form tag that is doing the asp. Although there are several potential bugs in your code if the html is not well formed for whatever reason. Then the only thing to do is to extend BasePage instead of Page. Substring startPoint, endPoint — startPoint ;. Remove startPoint, endPoint — startPoint ;. Append viewStateInput.

Append "rn" ;. Insert 0, "rn" ;. ToString ;. This is just a quickie to see if that helps anybody. The GridView in GeoTwitter had a problem as was. RegisterOnSubmitStatement this, typeof Page , "form disabler",. RegisterStartupScript this, typeof Page , "form re-enabler",. I also noted while here that Studio and NET 3. We had recently moved to using VS still compiling for NET 2 so am not sure where this issue is fixed but it appears to be so now.

Beware of option 3 if you use Response. Anything you render using response. Write in codebehind. NET form class and override the actual rendering of these elements…which seems more efficient than substringing your entire HTML anyways. I will post the solution if i can figure it out. Also if you want this change to apply to all of your pages in your application, create a page adapter override the render emssage in there, as in option 3 update.

Then add a browser file to the application, similar to the following:. This was a great help. Instead of overriding Render:. Which I call from the pages that testing has shown suffer from this problem. IndexOf String. Substring startPoint, endPoint — startPoint. Remove startPoint, endPoint — startPoint. Append "rn". Insert 0, "rn".

Naji, good catches I sincerly apologize. But haste always makes waste. Append Environment. Insert 0, Environment. Has everyone tried. That should take care of this problem without the need for any code workarounds. Tom from what I understand. I understand if it is about testing and that knid of stuff with having the new version.

Hi, I tried the VB versions of this code above. I use master pages with a menu based on the. Also, in the aspx mark up in the footer of my master page I have:. When using the BasePage the year now gets written at the top of the page instead of in the footer area. Any ideas on how to fix? This seems to work as the year string is no longer written to the top of the page using my original aspx mark up: The Friendly Menu Adapter is also working again by doing this. Any news on when a working 3.

There seems to be too many reported issues with the beta version to chance installing it. My problem seems to be related to the fact that I have quite a large wizard control which has 1 user control embedded within each wizard step. One of the wizard steps has a user control with a gridView inside.

Validation of viewstate MAC failed error

The gridview also uses the DataKeys feature and I think this is causing the problem. I keep getting the same error. But I was able to solve it. But we have another page that works practically it has the same output and design and it works the different was this. I found the current thread we are all reading on http: I kept getting the following error: If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. Auto Generate cannot be used in a cluster.

The problem was my login system worked fine on my local machine, but when I FTPed my application to my remote server and then launched it, the user names and roles I created locally would not authenticate. Login would fail for these users. If I then created new users with my application on my remote server they would authenticate properly.

In short, any time I moved my application to a new directory the users and roles created when the application resided in previous directories failed. I found a solution to the problem that worked for me. I wrote a short article about the process I used to fix the problem. Hope it helps:. Great article. I found this website for generating these keys for either macnine. Hi all… Nice post. Whether the upgradation to. We here are sick of these viewstate.

Our local environment does not get these errors where as these appear to occur in the Prod Servers. All the workarounds like keeping same machine key in NLB Servers, and then the workarounds suggested above are applied. The only difference is in local we have no firewall where as in Prod there is a Firewall….. So what type of settings needs to be addressed in the firewall to allow optimum size of Viewstate….

How large of a viewstate are you using? You can try disabling viewstate if it is 2. Installing 2. Thanks for the heads up. Maybe the original article should be updated, though. The listed workarounds seem too much of a hassle now. In also i am not able to solve this issue…. Plz mail me your suggestions at: I am having the same problem.

Our system has been in production for about a year, we never had this problem before. Since a week we are getting the following error.

The state information is invalid for this page and might be corrupted. Invalid viewstate. Invalid length for a Base char array. Deserialize String serializedState. CallHandlerExecutionSt ep. Execut e. PageError Priority: NET Framework 3. In fact, it seems that it is happening more frequently.

NET hidden inputs are. The interesting thing is that now I only get the "Validation of viewstate MAC failed" error, whereas I previously received all three errors mentioned above. My theory is that this is happens when a postback is triggered after a session has expired, meaning the postback is the first request of the session. This can probably happen one of two ways: I know this is happening from looking at click trails. When the error occurs, the first request of the session is a POST.

Small page with on two buttons, two text boxex, and dropdownlist. Clicking the button1 add caused the above error every time. I used a code-behind method when the Add button is clicked and do not use form. When I cleared the action property of the form, problem went away. I had the same problem with the Web application installed in IIS 5. After reading this article 2 or 3 times and after I tried the solutions in the article did not solve my problem , I discovered, in the problematic Web page, an old attribute in the tag "form". I had the following in the tag:. I am having this error on serveral sites.

I get this error even though I have disabled viewstate validation! Someone at MS needs to pull their forearm out of their backside and do some proper research into this and get it fixed. However, something the client said about leaving the page open for a while and returning later to click on a link was triggering the error. For those who need ASP. NET machine keys and French explanations, I wrote a simple generator you can find on my personal web site http: My question is, can someone cause the error simply?

Then it would be much easier to test these solutions. Basically, our app will timeout, and the login page, usually after sitting un-used for long periods of time will throw the error. Its occurred in localhost a handful of times. Maybe there is not a simple way, but just thought i would ask?

The form action was set to post to page "X". At that point I did a Server. Transfer to page X with the a data value in the row selected. Basically when they selected a row in the grid i sent them to a details page of that row. Turns out, I needed to remove the "action" from the form, and then it worked fine with no issues. My environment is Windows Server ,. Net 2. I explained my configuration: The site ws2 try to send values to ws1 by posting them with an asp: In my case, this error was caused by hitting a site memory cap instituted by my web hosting company.

They increased my limit and it went away. This is great information, thank you! I also encountered this exact issue and error message in the large web app that I program and support and uses. It seems though my experience of resolving the issue went like this. My issue kept coming back whenever I upgrade to. If I installed any. NET package 2. And I got all kinds of results installing different packages. In order to work this whole mess out, I started with uninstalling all. Then installed when I started installing. NET versions with a variety of 2.

However, there was ONE exception of having the page work when. Although, it seems I was not able to repeat that result. So I will stick by what I am saying about 2… for now. NET frameworks for 2. This installed. Does any of this make sense? Anyone else encounter this? By the way, here is a neat little app that allowed me to get deep into version numbers. I will check back for thoughts or questions on this whole version experiement…know that the results above are greatly summarized.

Just wanted to comment. We are using. So I will look at some of these resolutions and try to come up with something that works. Error message on an ASP. NET page after you submit a form that has the "action" attribute defined after you install the. NET Framework 2.

AutoGenerate cannot be used in a cluster. Has anyone seen a different solution? Validation of viewstate MAC failed. Everything that was posted here did not solved the issue. In our DEV machine it was working fine.

Validation of viewstate MAC failed | The Forums

But in our PRD servers. Has this something to do with Firewalls? One thing you can do is use one of the available ViewState Decoders to look at the ViewState and see what it looks like. The main thing to look for is if it is getting cut off. Seems to be linked to the session timeout. Out of options now! Unfortunately, the issue still occurred for me. I installed the latest SP and when I run the app through VS and perform the clicking, the error still persist.

If I left a page open for a while and than post back, the page redirects with Response. Redirect to login page. Than I try to login and on the first post back on the login page I get the error. I have a site with a master page and a form page, my form is nothing but a simple user registration, I have no grids or large controls.

My Viewstate is tiny as I am dealing with 10 textboxes and 12 checkboxes. I had this error come up when going from localhost to a commercial server. I did add in Web. Config a "machine key" entry, which before was lacking. I used this website: In fact, I found that all of these switches are mutually incompatible when put together my program would not run with all these parameters set they way they are above. I changed, as per this Microsoft suggestion, http: Transform …, true to …, false [the default]. In other words, I dropped the true switch. Redirect rather than Server.

But I emphasize this is probably not important at all. Just relating what I did. Most importantly—and you more senior programmers should get a good laugh out of this—I found the bottleneck in my program and eliminated it—so that the program was not "waiting" a long while, and "consuming" a lot of resources. The way it was before, I was using using System. Threading; and had many threads open. I notice this error would result when a lot of time passed with a window open and threads running at the server —and the user did not even have to do anything—but at the 3 minute mark the error would appear give or take 20 seconds.

So I eliminated the bottleneck in my program, and voila! Strangely, after doing the above, now I can even go past three minutes and no error results. Which raises my final and I think my best point:. So—what do I think caused the error? In short: Hey everyone, I am looking for someone that has this problem that is willing to work with Microsoft to try to get it resolved. I am interested in someone that has the 3. We want someone that has this reproduced that we can work with to fix it better.

If you are willing to help, please send me an email from http: My problem is only appearing when I use other browser than IE. The scenario is, after user logout from the session, it will be redirect to other website. Then user click back button from browser and try to login again Submit from the login page, the message of "Validation of viewstate MAC failed error" appear. But if we force the browser to reload, the message is gone. It is only happen to Chrome, Firefox, and Safari.

I am trying Ton's VB. I will advise if it works for two live busy sites where these invalid viewstate messages occur about 10 times per day. 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.

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Exception Details: For me only adding the machineKey -Element created by the machineKey generator into the Web. Config file solved the issue. Thanks for the contribution to all! Tom, do you understand WHY the machineKey should be the same on all servers in a web farm or cluster? The reason is that the viewstate is encrypted using the machine key. Once you inderstand that, then you would als understand why a machine key should be added when you only have 1 server instead of using your "workaround".

NET will generate one for you. Which i no problem untill the ASP. NET worker process recycles. When this happens between 2 postbacks, the viewstate which has been encrypted using the first generated machine key cannot be decrypted anymore using the newly generated machine key, resulting in thi error. So adding a machineKey will solve thi error withhout uing your workarounds….. Had the same issue. The page in question has a DataList with a control to advance to the next page. On the first page everything is fine. On any other DataList page I get the Validation error if I press any anything that causes a postback event.

The fix was simply to overwrite the form action in the page prerender function so that it matches the URL on display in the address bar. On inspection it looks like the system was taking the user readable URL and determining the page to be p-2, then taking the querystring after the transformation and adding it to the back end of the URL — creating total garbage.

I had this problem too. The reason is that webpages in one browser IE 7 are always out of date due to the browser settings. I think it will be solved by adding a machinekey, so that the viewstate value will not be changed. I'm using. And there was an javascript error when I used workaround 3 in IE 6. Accessing http: Directed to http: Error with the following address: The website is in hebrew: I was getting the same error without a webfarm, but only after a form with a gridview was left open and unused for some time.

In this case it turned out to be occurring as the session had expired set by default to 20 mins. I had two applications with this issue, one was solved as I had to use forms authentication and you just login again after session expires. The other was sorted by increasing the session timeout in the web. The ViewBasket. I am seeing this error on an asp. The page does a lot of validation, to make sure that for example exactly 3 out of 11 checkboxes are checked. I am not an expert coder and am not sure I understand the suggested workarounds about overriding the Render method or disabling the form and then re-enabling it.

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I am also not sure I understand what this has to do with the viewstate failing to load before the page is submitted — since the controls do not have default values set, it takes the human user some time probably minutes to go through the form, clicking on things, so how can it not have completely loaded yet? My question is: It seems to work without it. In our case it is an intermittent error anyway. At this point, the alternative I am facing is to take some time to break up the form into 4 or 5 pages, which might be a good idea anyway — I'm not sure which is more annoying to the user, filling out a very long form or filling out 4 or 5 shorter ones.

I was facing the same problem but in my case the problem was that I have the wrong action name in the form tag which was causing the problem. NET 4. Two different environments using load balancing. On one resetting the sticky sessions from 3 to 30 minutes resolved the issue and on the other turning off JsessionID in the balancer resolved the issue.

I am getting "invalid viewstate exception" even after trying all the options discussed above. I am using asp. I have a requirement to encrypt the viewstate for security reasons. Please let me know if you have some other solution for this when has not been discussed above.

I tried adding a machine key and inheriting from BasePage and got the same error. My workaround is to use Response. Even though I have set the Client Affinity in my server farm, the requests from same client are sent to different servers. This behavior I have confirmed in Monitoring and Management section in the server farm. Also I am getting following error in the client,. Yeah…so none of these suggestions work if you're using SharePoint with MasterPages enabled.

Try creating a custom upload form that is required to both allow the user to upload a file and save data entered by the user via custom field types on the same form and see what happens. HttpException 0x It appears if you have a large page which loads slowly for any reason.

Your Answer

When this happens, if you just try setting the page property "EnableViewStateMac" to false, it does not solve the problem, it just changes the error message in same navigation behavior: Other exceptions that seem to be the same problem look like: The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL: The first technique will cause only that particular file to be compiled in debug mode.

You should make sure that an application has debugging disabled before deploying into production scenario. Please refer to the following post in our forum for the discussion of this problem and the ways to fix it: Hi, This can be one tough bear for sure. Something that may work for you is to add a postback event like this: Lots of people waiting for an answer to this one. Is it something that is know and being fixed or are we all just completely lost and should give up and go back to 1.

All the best, Mark. Jacob , Aug 12, You must log in or sign up to reply here. Show Ignored Content. Share This Page Tweet.