If you see extremely high ping times (anything greater than 300ms is considered "high") or excessive dropped packets (which are indicated with an asterisk), this could be the source of your problem.
Note: The final "hop" to the end server often shows dropped packets and "Request timed out" even when the server is up and running without any problems. For security reasons, most servers do not respond to ping commands.
Firewall rules prevent the connection
If you are behind a firewall at home or at work, this can cause the issue. You will also want to be sure that your server's firewall is configured to allow SSH connections.
The server may be offline or shut down
Give it a few moments and try to reconnect. If your server has been rebooted, it should be back online shortly.
If the server still does not respond, you can check the server's status from your IONOS Control Panel.
Log in to your IONOS account, click Control Panel to open up the drop-down menu, then click Cloud Panel.
On the Servers page, click to select your server. The Status light will be green for a server which is up and running. It will change to yellow or red if there are problems.
To check on the server, click the Actions button, then select Access KVM Console from the drop-down menu.