jquery ajax problem (un autherized) in asp.net web page

hi,

I have ajax method using jquery and it works so fine, but after some time of keeping the page opened, if I click the button (to request web method from server) I got this error message in firebug:

JSON:
Message
      "Authentication failed."
      
StackTrace
      null
      
ExceptionType
      "System.InvalidOperationException"

Response:
{"Message":"Authentication failed.","StackTrace":null,"ExceptionType":"System.InvalidOperationException"}


so how can I fix this problem?
njgroupAsked:
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Meir RivkinFull stack Software EngineerCommented:
what is the statusCode returned? is it 401?
if u refresh the page are you able to make it run?
0
njgroupAuthor Commented:
yes, if I refresh the page, its gonna run fine
0
Meir RivkinFull stack Software EngineerCommented:
this is due to session timeout in ajax calls.
you can either customize your ajax response instead of throwing 401 exception:
http://stackoverflow.com/questions/5238854/handling-session-timeout-in-ajax-calls

or, redirect to the login page or to increase expiration session timeout in your web.config or preventing session timeout altogether:
http://xpapad.wordpress.com/2010/06/19/preventing-session-expiration-with-ajax/

for each one of the solution proposed you need to understand the implications first,

cheers
0

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