TMG error 12202 Forefront TMG denied the specified URL when accessing social.technet.microsoft.com

We use TMG as our proxy, and attempting to access TechNet sites I get above error, in the firewall log I get:

Denied Connection	14:02:46
<id id="L_LogPane_LogType">Log type:</id><id id="L_LogPane_WebProxyForward">Web Proxy (Forward)</id>
<id id="L_LogPane_Status">Status: </id>12202 Forefront TMG denied the specified Uniform Resource Locator (URL).
<id id="L_LogPane_Rule">Rule:</id>Allow Web Access for All Users
<id id="L_LogPane_Source">Source:</id>Internal (10.101.1.x:50363)
<id id="L_LogPane_Destination">Destination:</id>External (65.52.103.78:80)
<id id="L_LogPane_Request">Request:</id>GET http://65.52.103.78/Forums/en-US/Forefrontedgegeneral/thread/281ec060-7afb-484d-8276-75f63d811b8d
<id id="L_LogPane_FilterInfo">Filter information:</id>Req ID: 0c2825b2
<id id="L_LogPane_Protocol">Protocol:</id>http
<id id="L_LogPane_User">User: </id>anonymous
Image may be NSFW. Clik here to view.Additional information <id id="L_LogPane_ClientAgent">Client agent:</id>Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0) <id id="L_LogPane_ObjectSource">Object source:</id>Internet (Source is the Internet. Object was added to the cache.) <id id="L_LogPane_CacheInfo">Cache info: </id>0x2020000 (Response includes the CACHE-CONTROL: PRIVATE header. Response includes the SET-COOKIE header.) <id id="L_LogPane_ProcessingTime">Processing time:</id>344<id id="L_LogPane_MimeType">MIME type:</id>text/html; charset=utf-8

I have setup the Caching to off, to eliminate any problems there.

Thanks