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Problem in ajax collapsible panel extender


I am facing a very strange issue that is with ajax collapsible panel extender. It is perfectly working fine on localhost, but as soon we deploy it on our live dedicated server then randmly it shows the javascript error "onexpand" is undefined and sometimes "clientactivetabchnaged" is undefined on asynpostback, these are the event fire on onexpand and clientactivetabchanged event of collasible panel and tabcontainer respectively. I have a ajaxtabcontainer control, that holds gridviews. basically i am using on demand loading in this page.

Kindly help me to resolve the issue.
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First, do dev and prod environment run the same .NET frameworks, and fixes?
What .NET version do you use?
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.net framework 3
And the other Q?
Yes all the things are same on both servers.
If all versions, and patches, are the same on dev and prod, you have a IIS config err or other err on the server itself.

But are you sure that all patches and so on is alike? Usually thats the issue.

The only other opt i can think about is JS denial on the clients, but i assume you know about that issue.
Thank you for your reply
No there is no client issue, I access the dev and prod application from same client.
ok, I contact to company that maintain our dedicated servers about the versions and patches than I write to you again.
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