Error reading from remote server

[ArmenioPinto@xxxxxxxxx]

Hello all,

I have (what I consider to be) a working reverse proxy configuration with httpd, mod_proxy and mod_auth_tkt. The only problem that still persists is related to a specific intranet service that is hosted in IIS. For the first time, it works fine. But after a few minutes, the user gets the following error in the browser:

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Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /wtouch/wtouch.exe/index.

Reason: Error reading from remote server
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Hitting the refresh button a few times successfully loads the page but, after a while, the problem happens again. I've searched for possible solutions, without luck; there are some people reporting the same problem (for example http://www.usenet-forums.com/apache-web-server/42208-proxy-error-apache-2-0-50-reverse-proxy-iis.html) but with no answers.

The version of httpd is 2.2.3, the one that comes with CentOS 5.2. Thank you very much for your attention, cheers,

AP