Windows print clients can update print queue status by expecting the server to open a backchannel SMB connection to them. Due to client firewall settings this can cause considerable timeouts and will often fail, as there is no guarantee the client is even running an SMB server. By setting this parameter to no the Samba print server will not try to connect back to clients and treat corresponding requests as if the connection back to the client failed. The default setting of yes causes smbd to attempt this connection. yes