After the latest deployment, the error message "Invalid postback or callback argument" is being displayed

After deploying a project into production, we encountered the "Invalid postback or callback argument" error. Interestingly, this issue was not present during testing. Upon some investigation, we discovered that the error occurs under the following circumstances:

  1. An old version is accessed.
  2. A new version is accessed without clearing the Temporary Files.
  3. The drop down menu is changed twice (the first time works fine).

For clients experiencing this error, the temporary fix has been to clear their internet files. However, this is not an ideal solution. Does anyone have any insights on why this issue occurs and how to address it without relying on temporary fixes?

By the way, the application is ASP.NET 3.5 written in C#. We are using a JavaScript callback in a specific control which seems to trigger this issue.

c#javascriptasp.net

Answer №1

We decided against using the "enableEventValidation=false" workaround since the issue wasn't consistent. Instead, we found that clearing temporary files on a case-by-case basis resolved the problem early on.

Further investigation today led us to rename our javascript file, which successfully resolved the issue locally. It appears that each user had our old js file cached.

It's still unclear why it triggered an "Invalid Postback" message rather than a javascript error. While there are alternative ways to specify the version number in script tags, we chose to go with the renaming solution for now.

Answer №2

If you're currently utilizing a JavaScript callback, it's possible that the issue is related to event validation. One potential solution for this problem involves adding the following line to your web.config file:

<pages enableEventValidation="false"/>

By disabling event validation on your pages, you may be able to address this issue. However, it's important to note that turning off event validation is generally not recommended due to security concerns, as it helps verify that arguments are indeed originating from the server control.

For more information on why this error occurs, you can visit this link.

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