No error displayed when port is not available / Instance missing in ARC
Is your feature request related to a problem? Please describe.
I had an issue when 2 of the 3 instances where displaying in ARC despite the instance being shown in the list of instance (http://myserver:5898/api/v1/Servers) After checking everything we found out the reason was that the port wasn't open on the server. As soon as it has been open, it worked.
Describe the solution you'd like
When an instance from the list of instances (http://myserver:5898/api/v1/Servers) is not reachable, see an error message. It can be either in the console or it could be on the webpage a message disappearing after 5 secs.
Describe alternatives you've considered
None.