Overview
The license callback mechanism immediately updates a server after the license changes in either Manage2 or the cPanel Store. It cannot make any changes to the server. It only alerts the server that a change as been made to the license.
Note:
At least one port in the following table must be open for the license callback mechanism to work. The server only accepts requests to this API from cPanel & WHM. The license system does not send any other information to the customer’s server.
The license callback mechanism tries the following ports until one succeeds:
| Service | Port | Inbound | Outbound |
|---|---|---|---|
| cPanel | 2082 |
 |
|
| cPanel SSL | 2083 |
|
|
| WHM | 2086 |
|
|
| WHM SSL | 2087 |
|
|
| Webmail SSL | 2096 |
|
The license callback mechanism uses the following IP addresses to perform the license check:
208.74.121.0/24208.74.123.0/24
More:
For more information on how to configure your firewall for cPanel & WHM service, read our documentation.