this error is generated when user is validated ok and the next page is the menu with latests quotes performed:
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Windows Internet Explorer
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Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500
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I already tryied :

%@Page ValidateRequest="false"%

and

system.web
pages validaterequest="false"
/system.web

Still not working, any ideas?

T.I.A.