local printer connected via IP port not shown up in RDP Session

Hi,

having Windows 8 and Windows 10 Clients. Terminalserver is 2012 R2.

printers, connected to the clients via a printserver (\\server\printer) are shown up in RDP session and are usable.

But the same printer connected via network ip port are not visible in RDP (via default network IP port). There are clients connected via WAN where it is not sensfull to connect via printserver.

Any ideas where are the differences?

Greetings/Grüße Gernot