Outlook/SharePoint calendar sync 'error occurred connecting to site'

Question

Our SharePoint site was originally setup under a test name (oldname). When brought into production, I added an AAM to extend it to our production name (prodname). About 6 months ago, I added an SSL redirect in IIS which sends all http requests to https. With the addition of the SSL redirect, Outlook/SharePoint calendar syncing stopped working.

In Outlook, users are getting the error 'Task 'SharePoint' reported error (0x0004010F). 'The SharePoint List (Develop - Calendar) cannot be found If the problem continues, contact the SharePoint site admin. HTTP 404. An error occurred connecting to http://oldname.com/sites/abc/develop. A connection to http://prodname.com/sites/abc/develop, an alternate Web address for this SharePoint site, will be attempted'

Task 'SharePoint' reported error (0x80070005): 'You do not have permission to view this SharePoint List (Develop - Calendar). Contact the SharePoint site administrator. HTTP 303.'

My AAMs look like this for mapping collection: 'oldname.com'

Internal URL ------ Zone -------- Public URL for Zone

http://oldname.com Default http://oldname.com

http://prodname.com Internet http://prodname.com

https://prodname.com Custom https://prodname.com

I think I should also have the entry:

http://prodname.com Custom https://prodname.com

but according to what I've read, I can't have duplicate Internal URLs for the collection yet I also must have an entry where the Internal and Public URLs match.

Or perhaps it's not an AAM issue? Any advice would be greatly appreciated! Thanks.

Answer 1

You just have to set up the calendar sync with the appropriate web address using HTTPS. The error is telling you it's trying to connect to http://oldname.com/sites/abc/develop which isn't the URL you want configured. As a fallback, it is attempting to pull the calendar from http://prodname.com/sites/abc/develop, but that's hitting your HTTP Redirect in IIS.

Configure the calendar overlay using https://prodname.com/sites/abc/develop and this issue should be resolved.

Also, make sure that all user accounts requesting the calendar have proper permissions on the calendar list.