1. enable remote staging for a site
2. create custom publication
3. modify remote site ID
4. click on Publish to Remote Live
error message to be displayed
"Could not connect to address <host>:<port>. Please verify that the specified port is correct and that the remote server is configured to accept requests from this server. If everything is configured correctly, but you still encounter this error, the administrator has the option to forcibly disable remote staging."
Tested on master ea29731