I am a bit puzzled. External users are unable to set the automatic reply while connected with Outlook (RPC over Http).

"your automatic reply settings cannot be displayed because the serveris currently unavailable. Try again later."

I have checked the externalurl for the exchange webservicen, and have verified that I can access the exchange webservices from externally.

They get free busy info, but cannot set the automatic reply. 

When I access the externalurl (https://whatever.whatever.com/ews/Exchange.asmx), i get prompted to authenticate, which i do. The credentials are accepted and the expected xml page is displayed. I also do not get a certificate warning when accessing the website.

This kind of proves that both the externalurl configuration and the certificate are ok. Any idea? 

Autodiscover is not used.

Have verified that the settings in IIS are set accordingly:

Step 2: Verify IIS settings:
======================
1. On Exchange CAS server, open IIS console,
2. Go to default web site, double click SSL Settings,  make sure Client Certificates is set to Ignore
3. Click Autodiscover, double click SSL Settings,  make sure Client Certificates is set to Ignore
4. Click EWS, double click SSL Settings,  make sure Client Certificates is set to Ignore
5. Click OAB, double click SSL Settings,  make sure Client Certificates is set to Ignore
6. Please run IISRESET command to load the changes.
7. On client computer, open IE, try to visit https://mail.domain.com, confirm it is successful. Try to visit  

Exchange 2010 

Hello,

I advise you to go for a test with http://testconnectivity.microsoft.com/ and see if autodiscover is configured correctly. That can be the starting point of fixing the issue

Autodiscover is not configured in our environment.

I already used the testconnectivity, which completes all in the green.

As a fact ews and outlook anywhere use the same url.

Hi,

From your description, I recommend you check if you can set automatic reply via OWA externally. If yes, please configure the autodiscover in your environment and check if you can set automatic reply via Outlook externally. The Autodiscover service is responsible for providing the URLs for various Outlook features that manage functionality such as OOF, free/busy information and so on.

Hope this can be helpful to you.

Best regards,

Hi,

Any update?

Best regards,