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PageRequestManagerParserErrorException - reverse proxy

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Daniel Heskia
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Daniel Heskia asked on 11 Mar 2009, 02:21 PM
Hi all.

I made a control that filters a list based on selections from 1-5 radcomboboxes. The control sits inside an aspx page hosted on our own servers, and the page is called from our client through a reverse proxy and displayed on his web. The web page does not work when passing through our clients proxy. It works fine on his page when called directly, without the rev. prox.

When pressing search to apply the filter (or any other button), we get the error: 
Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Error parsing near DOCTYPE html PUB.

The client claim that they have embedded functionality for handling MS AJAX post back in their reverse proxy and that seems work without problems. But when we use Telerik components it doesn't work. How does the Telerik component differ in its post backs compared to MS AJAX (when using radcomboboxes)? Does anyone have suggestions to how I get the Telerik component to work through a reverse proxy or why this error occurs?

thx for any input

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Iana Tsolova
Telerik team
answered on 13 Mar 2009, 11:05 AM
Hello Daniel,

Please try troubleshooting as suggested in the below articles:

http://www.telerik.com/help/aspnet-ajax/web-resources-troubleshooting.html
http://www.telerik.com/help/aspnet-ajax/troubleshooting.html

Additionally, please make sure that this reverse proxy can manage MS AJAX applications.

Best wishes,
Iana
the Telerik team

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Daniel Heskia
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Iana Tsolova
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