Depends on why it didn't connect, right? Was it a timeout? Maybe an HTTP 401 Was it a DNS failure Was there a TCP reset immediately? Each one has a miriad of

Depends on why it didn't connect, right? Was it a timeout? Maybe an HTTP 401 Was it a DNS failure Was there a TCP reset immediately? Each one has a miriad of troubleshooting steps associated with it. Some could be local to the host, some could be network/firewall some could be from the remote host or behind that.