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Forefront TMG blocking access to Outlook Web Apps

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I am receiving an error when trying to reach the Outlook Web App web from the link on the Office 365 home page.

 

The internet explorer shows the following message:

 

  • Error Code: 502 Proxy Error. The request was rejected by the HTTP filter. Contact your Forefront TMG administrator. (12217)
  • IP Address: yyy.xx.42.33
  • Date: 7/31/2011 5:10:06 AM [GMT]
  • Server: DC02TMGS03.corp.xx.com
  • Source: web filter

URL: https://outlook.com/owa/office365.com?exsvurl=1&ll-cc=en-US

 

I believe it is blocking the office365.com as it looks like an executable file.

 

Adding the url to the whitelist on the Forefront TMP is not an option. We are a consultancy company with roughly 20 consultants working onsite and we are using the client's network most of the time. We are having this issue with other clients as well.

 

This is preventing us from using the Outlook Web Apps, which on of the primary reasons we intend to use subscribe to Office 365.

 

I would appreciate if we could highlight the issue and find a solution if possible.

 

 

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