This issue only applies for connections via the Linchpin Mobile Cloud Gateway, direct connections will not have a problem.
After the host name of the system is changed the app can connect to the system via the Linchpin Mobile Cloud Gateway and content is loaded. But you get an error message when you try to post a comment or a new micropost.
The Linchpin Mobile Confluence App needs to establish a completely new connection with the Linchpin Mobile Cloud Gateway.
To resolve this issue please restart Confluence after changing the host name of the system.