A 403 forbidden error message is displayed when Calendar Plus tries aggregate a calendar from Microsoft Exchange Server 2007.
Product & Version
Calendar Plus Standard and Professional edition
Version: 4.X.X and below
Calendar Plus cannot connect to exchange 2007 if the “Require SSL” checkbox is checked in Exchange virtual directory. The checkbox is checked by default even if the website doesn’t have SSL.
To resolve the problem you have to check that “Require SSL” checkbox is unchecked:
1. Open IIS Manager on Exchange server
2. Open the properties for the Exchange virtual directory under the default website -> directory security -> Edit for Secure Communications
3. Uncheck “Require SSL”.
Optionally provide private feedback to help us improve this article...
Thank you for your feedback!