There is an attempt to upgrade Office 365 application. Endpoint was upgraded successfully, but task "Upgrading resources of application 'Office 365'" fails with the following error:

RESTEASY004655: Unable to invoke request
Connection reset

The following error could be seen in core.log :

Jun  6 08:03:39.279 : DBG [task:3789579:85 Thread-1230-(ActiveMQ-client-global-threads):5033 pau]: c.p.p.s.c.e.EndpointExecutorBean endpoint call failed: Could not invoke endpoint url '' of application instance with UUID 'c138088f-7f3f-4fce-be68-88bcc69e15fb'. RESTEASY004655: Unable to invoke request: Connection reset

The following event is represented in Event Viewer on the application endpoint:

Event ID: 36888
The following fatal alert was generated: 20. The internal error state is 960.


Management Node is unable to establish secured connection with the endpoint because SSL/TLS settings are misconfigured on the endpoint side.


Configure SSL/TLS settings for the endpoint as described in article.