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Showing posts from January, 2014

Automating IP addresses with TMG

In the past few months I've had the "opportunity" (note the quotes, maybe I'll write a post about all the troubles I've run into) to deal with some Office 365 integration projects.

When integrating one or more cloud services with Office 365 or Office 365 with on-prem Exchange, it is typical to limit the IP addresses that are aloud to communicate between services. This is an important layer on the security model and obviously reduces the attack surface. Microsoft maintains lists of IP addresses for the various services here:

That page links to other pages with more specific information about various other Microsoft cloud services such as the link below for Exchange online. for example.

At the time of this writing, you'll notice that the lists are inconsistent between pages. >:-(

Microsoft on two separate Premier Support Calls has told me…