Help❗ Unable to connect?

Recently I have tried to connect to a server and no matter what I do, I get the same message. ;;
"NetworkException. Unable to resolve host
command net connect was executed"

Does this mean I have been banned somehow, my client is outdated, or some other problem? Is there any solution to this? I would greatly appreciate it if someone could explain to be what happened and what I should do to fix this. Thanks!

Having the same problem.............. anyone help!