Exchange Integration Folder access

[Chritz]

Infos:

Used Zammad version: 2.7.0
Used Zammad installation source: DEB
Operating system: Ubuntu 16.04 LTS
Browser + version: Firefox

Actual behavior:

Zammad can not access Exchange 2010.
Credentials checked multiple times.
EWS interface to Exchange checked.

production.log

I, [2018-11-08T08:03:55.183741 #973] INFO – : Started POST “/api/v1/integration/exchange/folders” for 127.0.0.1 at 2018-11-08 08:03:55 +0100
I, [2018-11-08T08:03:55.193851 #973] INFO – : Processing by Integration::ExchangeController#folders as JSON
I, [2018-11-08T08:03:55.193930 #973] INFO – : Parameters: {“endpoint”=>“https://***********.de/EWS/Exchange.asmx”, “user”=>“edv@****.de”, “password”=>"[FILTERED]"}
W, [2018-11-08T08:03:55.471810 #973] WARN – : Could not retrieve folders. ErrorAccessDenied: Der Zugriff wird verweigert. Überprüfen Sie die Anmeldeinformationen, und versuchen Sie es dann erneut. (Viewpo$
/opt/zammad/vendor/bundle/ruby/2.4.0/gems/viewpoint-1.1.0/lib/ews/folder_accessors.rb:167:in `find_folders_parser’ …

Checked by:
https://testconnectivity.microsoft.com

[MrGeneration]

Your exchange-Server is telling you what’s wrong:

Could not retrieve folders. ErrorAccessDenied: 

Are you sure that the account you’re using has the needed rights to access to ressources you try to get?
Normally internal server errors are the remote site (so your exchange-server), maybe your logfiles on the server give a further hint.