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Internet Published Calendars Requiring OWA Logins??

Posted on 2014-01-07
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Last Modified: 2014-01-07
I'm running Exchange 2010 SP1.  I have internet publishing for calendars setup and the ability to "publish calendar" is available to the users with the appropriate sharing policy.

I have published calendars with both Public and Restricted access levels.  On both sets, I sent the internet share links to myself and have tried to access them from outside the corporate network.  When attempting to use any of the links (either HTML web view or ICS subscription) for either of the calendars (Public with its readable URL or Restricted with the obscure URL) I am taken to the OWA login form.  

The login form URL does show the redirect target of the calendar page, but that completely obliterates the desire to be able to publicly share these calendars.  We want anonymous internet users to be able to open an ICS file and subscribe to our calendar.

How can I get the published calendars to just open without first dropping the internet user into our Exchange server's OWA login page?
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Question by:AcmeWidget
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by:AcmeWidget
ID: 39763082
I forgot to mention, the /owa/Calendar virtual directory has Anonymous authentication enabled and all other authentication types (including Forms) disabled.
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AcmeWidget earned 0 total points
ID: 39763138
The URL generated by Exchange started with http:// and our system is set to redirect all non-SSL traffic to the https:// site.  This was causing the redirect to the login form at https://owaserver

Manually altering my link's URL to https://owaserver/owa/Calendar/xxxxxx (added the SSL "s") solved the problem and allowed me to open the ICS file without authentication.

If you are encountering the same issue, check your URL and try hand crafting it to use HTTPS.
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