Richard Hicks' Forefront TMG Blog

Earlier today Twitter suffered a serious outage. To further complicate matters, it appears that Microsoft Reputation Services (MRS) is now categorizing twitter.com as a phishing site.

I’m not certain what the reason for this categorization is for, but based on past experience it may have to do with Twitter services running on a shared hosting provider that previously included services that were identified as phishing related. To resolve this issue, open the Forefront TMG management console, highlight the Web Access Policy node in the navigation tree, then click Configure URL Category Overrides in the Tasks pane and move the URL pattern *.twitter.com/ to the Online Communities category.