ErrorNetworkError - how to fix it?

Description of error code "ErrorNetworkError"

Domain: Exchange

Code: ErrorNetworkError

Type: Configuration error (You are often able to resolve this type of error.)

Description: A network error occurred. The Exchange server could not be found, or the integration was actively refused.

Possible solution: Check that the EWS URL is specified correctly.

Alternatively, check that integration is not blocked by a firewall or another gateway.