Exchange 2016 contacts 3CX v15.5 update 4

[MartijnH]

Hello,
we have the same problem what is in this thread: https://www.3cx.com/community/threads/v15-exchange2016-contacts-sync.46386/

We are using an comodo certificate on the Exchange server.

When we are goint to the owa website we have no certificate warnings.

 

[StefanW]

the error is very clear and is generated by the Host OS and not 3CX. It might be that you need to add the Root CA into the Truststore of the OS in order to allow the connection to be made.

https://support.comodo.com/index.php?/comodo/Knowledgebase/Article/View/636/17/
Contact Comodo for further information.