What does 'Connection Refused' mean?

I am trying to get my SDR-IQ to join the list of on air servers but get a link status error = ko message in the logfile.

How many server instances can I start?

I lost my upload key, what should I do?

My server is not shown on the SDRSPACE.com map.

What bandwidth does a server need?

Why is the audio breaking up?

What is the minimum operating system and hardware requirement?