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KB0240 - Appointments cannot be created or updated
If you are using RealTime Services with Resource Central, WebTeam Central or Exchange Central, you are likely to experience one of the following symptoms in the relevant product:
And when you run the configuration test within Realtime Manager, the log will show the following error message: "The client and server cannot communicate, because they do not possess a common algorithm."
Realtime Service uses Transport Layer Security (TLS) to support connection to Office 365. As of October 31, 2018, Microsoft Office 365 will no longer support Transport Layer Security versions 1.0 and 1.1, that’s why you may experience issues when connecting to Office 365 if no upgrade is implemented.
This can also be the case for On-premise environments, where security requirements are set to TLS 1.2.
For further information on the mandatory use of TLS 1.2 in Office 365, please refer to this article: https://support.microsoft.com/en-us/help/4057306/preparing-for-tls-1-2-in-office-365
Applies to: All Realtime Service versions before 18.104.22.168
Reference: TFS #174811
Knowledge base ID: 0240
Last updated: Sep 04, 2018