Posted by: Shantham | March 9, 2009

The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.

The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.

The above error will be thrown at the time of updating Library or Lists items due to authentication problem, or We didn’t have the rights to update the items.
By using the follwoing code, We can overcome this issue,

Web.AllowUnsafeUpdates = true;

or we can also use the follwoing code to overcome the above error, this will affect the WebApplication. This will change the Security settings of a Web Application to allow the anonymous user to update item.

web.Site.WebApplication.FormDigestSettings.Enabled = false;
web.Site.WebApplication.FormDigestSettings.Enabled = true;

or we can change the settings in Central Administration to anonymously update the items. But this method will be dangerous.

  • Central Administration > Application Management > Web Application General Settings
  • Choose the WebApplication to overwrite the settings
  • Select the option Off in Web Page Security Validation as follows,


Read more…



  1. Hi Shantha Kumar,
    I am currently facing the same issue, while debugging my code I can able to access the sharepoint sites & lists from my custom page. But when I host that website on IIS it’s giving me the same error
    “The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.”
    I had tried out all the options you have mentioned as well as few others.
    1. Set AllowUnsafeUpdates property of SPWeb / SPSite to true
    2. Set web.Site.WebApplication.FormDigestSettings.Enabled to false
    3. writing code inside SPSecurity.RunWithElevatedPrivileges()
    4. using WindowsImpersonationContext wic = WindowsIdentity.GetCurrent().Impersonate()
    5. Changing authentication provider in Central Administration
    • Central Administration > Application Management > Authentication Providers
    • Select “Zone”
    • Check “Enable Anonymous Access”
    6. Turn off Web Page Security Validation in Central Administration
    • Central Administration > Application Management > Web Application General Settings
    • Select the option Off in Web Page Security Validation
    But none of them working for me except turn off the security validation from Central Administration, but it’s not the safe way to do it.
    Please guide me,

  2. this really helped me. Thanks so much for posting.
    I spent more than 11 hrs trying to get this to work – keep up the good work!

  3. Thanks,
    It works for me.

  4. Yeah really good and helpfull. Thanks for the article

  5. […] here… Uncategorized2007, sharepoint, […]

  6. […]… […]

  7. saya tidak bisa daftar mwo

  8. Hi,

    Thanks, it worked for me. Indeed you saved quite a lot of effort of mine.

    Thanks again,


  9. I get the following error when i try to allow
    Web.AllowUnsafeUpdates = true

    Request for the permission of type ‘Microsoft.SharePoint.Security.SharePointPermission, Microsoft.SharePoint.Security, Version=, Culture=neutral, PublicKeyToken=71e9bce111e9429c’ failed.

  10. thanks man
    it really helped me.

    You saved lot of searching time for me.


  11. You may also try this approach as discussed here

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  13. Thank you buddy.. It is worked for me..

  14. I had trouble with this exact error message, and none of the tricks here mentioned or other places helped me at all, but I think this solution that I figured out can help many others out there as well:
    HttpContext.Current.Items[“FormDigestValidated”] = true;

  15. Doing
    like was suggested at
    (which are cited above in other posts) will also cause this error, even after putting in the fix, so I removed it so the fix could work.

    I fixed it using both
    web.AllowUnsafeUpdates = true;
    web.Site.WebApplication.FormDigestSettings.Enabled = false;
    and re-enabled FormDigestSettings (set to true) at the end of my code. I might’ve only needed one or the other but didn’t want to chance it.

    To anyone trying web.ValidateFormDigest(), you probably did more harm than good – remove this from your code and try the other lines, here and it should work.

    To the author of this blog: THANK YOU for this blog! 🙂


  16. Update to my other comment:
    Found that doing
    web.Site.WebApplication.FormDigestSettings.Enabled = false;
    does not work anyway, even with RunWithElevatedPrivileges if your System Account (really the account that is running your App Pool, configured by your SharePoint Admin) is not a farm admin account, which ours was not. It was really just the web.AllowUnsafeUpdates = true that I needed.

  17. Its Works ……….thanks alot

  18. It is working for me.
    Gaurav Goyal

  19. Thanks for sharing your brain dump.
    Its Working in my case.
    Keep sharing your knowledge

  20. thanks man working fine

  21. Thanks alot .. this solved my problem 🙂

  22. Because of FormDIgest control we got this issue.
    Refer it know why?

  23. thank you very much. It worked fine. However,

    i want to know the potential issues that may cause in making security to ‘off’. I guess the recommended is ‘on’

    please clarify my doubt.

    thank you.

  24. thanks for the post


  25. Hi,this is really helped a lot thanq for sharing

  26. Really Help to me….. thanks a lot.

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