FAQ of On-premise Edition Bitrix24

Bitrix24 Self-hosted administration instruction 

Error curl: Failed to connect to portal port 443: Connection refused

Means that the rest request from the ChatApp application does not go to the box portal.
The causes of the error may be:

• External requests are blocked on ingos.moscow portal web server, firewall must be configured;
• is an incorrect configuration of the box portal web server.

Example: Protection of server activity worked and simply blocked ChatApp requests during the installation phase of the application. The application was unable to fully install all of its components and connectors. The solution is to disable such a filter. And then reinstall the application.

Message not delivered

The message is sent from different domains. It is necessary to set up only one domain for the portal.