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Viewstate verification failed server error when clients try to submit form RRS feed

  • Question

  • User-1275373165 posted

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    Hi Guys. I have a unique issue that I have not been able to resolve by looking at other Viewstate verification errors online.

    Background: A client comes into our site, signs in and proceeds to an e-sign form. Once they click the submit button, they get the viewstate error. Sometimes they get through and get the error on either of the next two forms. This happens sporadically. Maybe 2 out of 10 receive the error. All clients who received an error were able to go back in a few hours later and complete the forms without error. My hosting company, programmers and myself have not been able to replicate the error yet.

    This has been happening for the last 2 weeks.

    So we have three pages that this is occurring on one domain and another separate page on a different domain. All on the same windows dedicated server. So first thought is that, I have not changed any code in months, my SQL admin has not changed code related to these processes in several months, so it must be the server. I submitted a ticket with Liquidweb. They could not find anything wrong.

    Funny thing is, I do not use viewstates in my web.config or on my forms. I did try using the disable viewstate code in the config file. I also checked the viewstate base64 code in a decrypter, that looked fine. I checked the sessions are enabled and enough time is set for timeouts. No patterns have occurred, like specific times, browsers, or locations.

    I’m currently having the programmers that we work with go through the code and server settings.

    Conclusions: It seems like the cookie or session data is being lost somewhere along the process. I checked the ideal timeout settings and they are at 20min. More than enough time for someone to e-sign, (our reps walk the client through the entire process, so I’m sure on the timeframe.) I still think it’s a hosting issue, but they say nothing has changed in two weeks.

    It’s starting to come down to finger pointing now between the hosting techs, sql admin, it admin and programmers. Grrrr.

    Here is the error:

     

    Event code: 4009
    
    Event message: Viewstate verification failed. Reason: The viewstate supplied failed integrity check.
    
    Event time: 3/23/2011 8:54:31 PM
    
    Event time (UTC): 3/24/2011 12:54:31 AM
    
    Event ID: aaaa4d1a98f84f05a61e45a82178275c
    
    Event sequence: 33
    
    Event occurrence: 4
    
    Event detail code: 50203
    
     
    
    Application information:
    
        Application domain: /LM/W3SVC/6983/Root-1-129454012216742214
    
        Trust level: Full
    
        Application Virtual Path: /
    
        Application Path: C:\Inetpub\vhosts\secure.xxx.com\httpdocs\
    
        Machine name: HOST2-xxx
    
     
    
    Process information:
    
        Process ID: 351124
    
        Process name: w3wp.exe
    
        Account name: HOST2-xxx\IWPD_2(xxx)
    
     
    
    Request information:
    
        Request URL: https://secure.xxx.com:443/ClientForms/creditor_info_form.aspx
    
        Request path: /ClientForms/creditor_info_form.aspx
    
        User host address: 166.56.104.216
    
        User: 
    
        Is authenticated: False
    
        Authentication Type: 
    
        Thread account name: HOST2-xxx\IWPD_2(xxx)
    
     
    
    ViewStateException information:
    
        Exception message: Invalid viewstate.
    
        Client IP: 166.56.104.216
    
        Port: 1812
    
        User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
    
        PersistedState: /wE....
    
        Referer: https://secure.xxx.com/ClientForms/creditor_info_form.aspx
    
        Path: /ClientForms/creditor_info_form.aspx 

     

     

     

    Wednesday, March 30, 2011 5:10 PM

All replies

  • User-1275373165 posted

    Update: Went back in time in my event viewer and discovered that the increase in errors started at the same time we discontinued using a CDN and switched everything back to the one host. This doubled our bandwidth. So I could see how the load might increase the number of errors.

    Thursday, March 31, 2011 3:02 PM
  • User1483970546 posted

    It seems that session/application object is automatically expiring on the server. There could be many reasons of that and are mostly related to the server configurations. I also faced the smiliar issues couple of times and the reason was always different and related to server configuration. Event viewer can help you to figure out the real cause.  Following smiliar thread might be helpful for you http://forums.asp.net/t/1468511.aspx/1?Session+Expire+Automatically+

     

    Thanks

    -Akhtar

    Saturday, April 2, 2011 11:53 AM
  • User-481631678 posted

    There are two main reason for above error:-

    1- You are on a web garden/web farm and you have not set a machineKey in your web.config. You have to define a machineKey in your config file like this:-

     

    <?xml version="1.0"?>
    <configuration>
        <system.web>
            <machineKey validationKey="21F090935F6E49C2C797F69BBAAD8402ABD2EE0B667A8B44EA7DD4374267A75D7AD972A119482D15A4127461DB1DC347C1A63AE5F1CCFAACFF1B72A7F0A281B"    decryptionKey="ABAA84D7EC4BB56D75D217CECFFB9628809BDB8BF91CFCD64568A145BE59719F" validation="SHA1" decryption="AES"/>
        </system.web>
    </configuration>

    To create a machine key you can checkout this link:-

    http://www.eggheadcafe.com/articles/GenerateMachineKey/GenerateMachineKey.aspx

     

    2- Your application pool is restarting and causing above error. To resolve this reason see:-

    http://zeeshanumardotnet.blogspot.com/2009/07/why-sessions-are-terminatedloss.html

     

     

    Monday, April 4, 2011 12:48 AM
  • User-1275373165 posted

    Thanks for the help. I actually surprised to not see the machine key in the web.config file. I will have the programmers take a look at that. I'll also check out the application pool issue. I did mention this to my hosting company before and they check everything out and said it was good. but I'll do more research on that part. Thanks.

    Monday, April 4, 2011 11:15 AM
  • User-1275373165 posted

    Talked to my programmers. They said they tried to add the machinekey. However, because our wacky scripting, the global.asa file is not loading. Our current login and main customer account info is coded in classic ASP and our e-sign and other forms are all done in .net. So the conflict is preventing the file from loading. Seems logical and fishy at the same time. Would like to get other peoples opinion on this before issuing a recode of the classic ASP. Thanks.

     

    Tuesday, April 5, 2011 12:41 PM
  • User347897345 posted

    Viewstate generally fails when there is a slow response. You can try setting enableEventValidation="false" viewStateEncryptionMode="Never" in the web.config.

    Hope it helps.

    Tuesday, April 5, 2011 2:45 PM