Print from external network

Hi, everybody

We need to print to a CUPS queue from Windows PCs on an external network, but that’s not possible. It works fine from machines on the local subnet.

We get the following entry in cups error log: [Client 1040] Unable to encrypt connection: The TLS connection was non-properly terminated.

Could somebody please give me at tip as of how this might be solved?

Many thanks in advance!

best regards