Connecting to a remote host via Transfer Tool results in: Connection timed out

Symptoms

The following error occurs when connecting to a remote host using the Transfer Tool:

CPANEL_ERROR: The system stopped waiting to connect to “192.0.2.0” on port “22” after 15 seconds.
Failed to establish session and parse security token: 599 Internal Exception (Could not
connect to '192.0.2.0:2087': Connection timed out) at
/usr/local/cpanel/3rdparty/perl/530/lib/perl5/cpanel_lib/cPanel/PublicAPI.pm line 526.

Cause

This can be caused by one of the following reasons:

• A firewall configuration on the remote host is blocking the server
• The SSH port that was used to connect to the remote host is incorrect.
• The source server's hostname is proxied through Cloudflare

Resolution

You can manually verify the remote host is reachable by the server you are transferring to.

1. Connect to the remote host server using SSH as the root user.
2. Verify which port SSH is configured to use:

# sshd -T | grep '^port

3. Connect to the destination server using SSH as the root user.

4. Use either netcat or telnet to try and reach the remote host using it's SSH port:

   # nc -vz $IP $PORT

   # telnet $IP $PORT

   If your server does not have netcat or telnet installed, you can also try and connect using SSH directly:

   # ssh -p $PORT root@$IP

5. A "connection timeout" confirms that comminucation is being prevented between the two servers:

   CONFIG_TEXT: # nc -vz 192.0.2.0 22
   Ncat: Version 7.50 ( https://nmap.org/ncat )
   Ncat: Connection timed out.

   CONFIG_TEXT: # telnet 192.0.2.0 22
   Trying 192.0.2.0...
   telnet: connect to address 192.0.2.0: Connection timed out

   Confirm that the firewalls of both servers allow communication on the specified SSH port both inbound and outbound, and try again.