TMG 2010 - Autodiscover fails on Exchange 2010

Federico Cruz
Federico Cruz used Ask the Experts™
Hi guys,

 I'm having trouble with the autodiscover feature in Exchange 2010, users can't setup Outlook from outside the domain network.

I ran the Microsoft Connectivity Test and it failed:

Our mail server is behind Forefront TMG 2010, but that path is published.

I don`t understand why TMG is blocking connections to that URL if it`s published on the rule.

Any help would be appreciated.

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Datacenter platform engineer Lindows

Did you try the "Test Rule" button on the TMG to verify that TMG is able to reach internal server ? What is the result ?
Also, cnayou show us the "To" tab settings, the "Authentication Delegation" tab settings and the "Bridging" tab settings ?

Do you publish also OWA with the smae TMG and does it work ?
look at PUBLIC NAME tab for rule. Most likely you've published your rule for but with autodiscover it's

the error message is rather conclusive on this

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