How can I fix the error: The licensing server was invalid or could not be reached ?

1. Make sure that you are not blocking the licensing server IP addresses on the servers firewall. Imunify360 is known to block our server IPs for some reason. Our licensing server IP addresses are:

IPv6: 2607:5300:60:2106::

You can run the following command to see if your server can connect to the licensing server. You should get a response of Verify return code: 0 (ok) if the connection was successful.

openssl s_client -connect

If you get the error below that means that your server cannot connect to our licensing server (usually that means there is a firewall or connection problem):

openssl s_client -connect - returns:
socket: Bad file descriptor

2. Make sure that the date and time on the server is correct (The wrong time will cause the SSL certificate connection to fail). You can sync your server time using the command:

/usr/sbin/ntpdate -b -s

3. Many times this error can be fixed by restarting the Plesk panel:

/etc/init.d/psa restart

4. Lastly make sure your openssl and curl packages are up to date:

// Centos / RHEL
yum update openssl curl

// Debian / Ubuntu
apt-get update  openssl curl
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