Bug 3290

lpd(8) does not accept another port number as documented in the manual
page. Looking at the sources for lpd, lpd does not recognize the additional
port arguement. in lpd.c (main())

                sp = getservbyname("printer", "tcp");
                if (sp == NULL) {
                        syslog(LOG_ERR, "printer/tcp: unknown service");
                        mcleanup(0);  
                }       
                memset(&sin, 0, sizeof(sin));
                sin.sin_family = AF_INET;
                sin.sin_port = sp->s_port;
                if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
                        syslog(LOG_ERR, "bind: %m");
                        mcleanup(0);
                } 

Later in the code it make sure the port is a reserved port (lower than 1024)
for security purposes, so even if we could change to port number it would
only work for reserved ports.

Fix: 

remove the port# information from the manual page.
How-To-Repeat: 
# lpd 4
# netstat -a