TMG Forefront Proxy blocking internal HTTP requests

Posted by Pascal on Server Fault See other posts from Server Fault or by Pascal
Published on 2011-03-18T23:18:16Z Indexed on 2011/03/19 0:11 UTC
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proxy

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blocking

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Forefront

I have TMG Forefront with Proxy installed and configured. However, whenever I make internal HTTP requested to servers on the internal network with a fully qualified dns name, the proxy denies the connection.

Denied Connection FRW-02 18/03/2011 20:06:37 
Log type: Web Proxy (Forward) 
Status: 12202 Forefront TMG denied the specified Uniform Resource Locator (URL).  
Rule: Default rule 
Source: Internal (10.50.75.21:21492) 
Destination: Internal (10.50.75.10:8080) 
Request: GET http://app-01.mydomain.com.br:9871/internalwebserver_deploy/MyServiceService.svc?wsdl 
Filter information: Req ID: 0a157279; Compression: client=No, server=No, compress rate=0% decompress rate=0% 
Protocol: http 
User: anonymous

How can I get around this block? This is an internal call, so it should block it. If I use only http://app-01:9871/internalwebserver_deploy/MyServiceService.svc?wsdl, without the domain after the server name, then it doesn't get blocked.
10.50.75.10 is the firewall's ip, and the internal network's gateway.

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