In Windows 11 update version 22H2 the method of communication between client and server has changed from RPC over Named Pipes to RPC over TCP.

Quote from Microsoft:

Update details

• For print related communications, by default, RPC over TCP is used for client – server communications.

  • Using RPC over Named Pipes for print related communication between computers is still available but is disabled by default.
  • Using RPC over TCP or RPC over Named Pipes for print related communication can be controlled by Group Policy or through the registry.

• By default, the client or server only listens for incoming connections via RPC over TCP.

  • The Spooler service can be configured to also listen for incoming connections via RPC over Named Pipes. This isn't the default configuration.
  • This behavior can be controlled by Group Policy or through the registry.

• When RPC over TCP is used, a specific port can be configured to use for communication instead of dynamic ports.

• Environments in which all computers are domain joined and support Kerberos can now enforce Kerberos authentication.

See also

• RPC connection updates for print in Windows 11 learn.microsoft.com
• Windows 11 22H2: network printing switched to RPC over TCP ghacks.net