No one has responded to this discussion for at least a year, so this information may be out of date. If you're looking for information about this topic, please search for a more recent discussion or post a new question.

Forefront TMG blocking access to Outlook Web Apps

  • 8 Replies |
  • This post has 0 verified answers |
Answered (Not Verified) This question has suggested answer(s)

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:
  • Source: web filter



I believe it is blocking the 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.



  • Post Points: 35
All Replies
Page 1 of 1 (9 items)