Generalizing your issue, I can say that there can be three kinds of SSH that you may encounter-
1. Hostname resolution.
2. Connection timeout
3. Connection refused
Now a common problem solver can be to check your firewall. Some connectivity problems can be caused by firewall configurations. If your firewall is set up to block certain ports or services, it can prohibit you from connecting. If you have added a firewall rule that allows your local machine to connect by IP address, verify that the IP address assigned by your ISP has not changed. If it has, then you need to modify that firewall rule to permit the new IP address or address range.
For whichever firewall your system has, you’ll need to familiarize yourself with how to modify its rules. Ubuntu servers usually run UFW; CentOS servers often use FirewallD. If you’re not using either, it’s like that you’re using iptables. You’ll also need to know which port your SSH service is using. You can also try to check the SSH service port. There are two general ways that you can use to check which port the SSH service is running on. One is checking the SSH configuration file, and the other is examining the running process. I think these two will surely help you out. Sorry in advance if it doesn't.
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mylowes
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