It can; normally it is in relation to the machine not contacting the server - this can be done when the server pings the clients and receives no response, or if the server key doesn’t link with the client.
So, your first four messages can sometimes be mitigated by that offline/online tab.[quote=“orogor, post:1, topic:2836”]
Server key not on client
Server just restarted and client not yet attached to server
In case of multiple server :
Client discovery not enabled for that client, thus client doesn’t attach to server
Client already backuping to another server
[/quote]
That error isn’t always associated with the client being offline; sometimes the service isn’t running, or there is a problem with the drive or file system - or possibly in your case, the connection was abruptly stopped.
But, I wholeheartedly agree with you that more explicit messages would be nice. At the very least, it would benefit troubleshooting a lot more.