Ciphers
webPDF allows you to set the ciphers used for TLS communication.
In the default configuration, the server automatically selects the ciphers based on the set TLS and the default Java Runtime Engine.
It is also possible to manually set the list of ciphers.
In the dialog, set the mode to “Custom settings” (1). Under “Active ciphers” (2) you will see the list of the currently selected ciphers. With the drop-down selection (3) you can select a predefined cipher or enter one manually. Click “Add” (4) to add it to the list.
At https://ciphersuite.info/cs/, you will find a list of TLS ciphers for the respective TLS protocol.
If you save the list, the server must be restarted for the configured ciphers to be activated.
The option Force order can be used to prompt the client to select the ciphers in the configured order.
Check that the selected ciphers are valid and have also been activated when starting the server. Not every cipher is available for the selected TLS protocol and Java.