Zuletzt aktualisiert am: December 18, 2018
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Behaviour:

The event viewer repeatedly shows the following message:

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Gateway Role 1088:
Could not secure an inbound connection with the host 192.168.0.100:53627.
Die angegebenen Daten konnten nicht entschlüsselt werden
Error type:
System.ComponentModel.Win32Exception
Error number:2147500037
Program location:
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As a result, an SChannel error will appear in the Windows applications event viewer. It may look like this:
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SChannel 36887:
Es wurde eine schwerwiegende Warnung vom Remoteendpunkt empfangen. Die schwerwiegende Warnung hat folgenden für das TLS-Protokoll definierten Code: 51.
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Please note that ID and code may differ.

Explanation:

Windows 2008 R2 and later does not support older, weak cipher suites, which are considered cracked. Therefore, a TLS connection is not established if the delivering server can only process these. As a result, the above-mentioned warnings and errors are logged. The delivering server must then perform a fallback to plain text. For this it is necessary that the delivering server establishes a new connection, since the old connection, where no TLS connection could be established, must be closed.

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