"lpc: connect: No such file or directory couldn't start daemon" error in lpd
If you run BSD lpr, sooner or later you will experience the mysterious lpd connect problem. Jobs pile up in the queue, but restarting the printer (lpc restart myprinter) gives the following error:
lpc: connect: No such file or directory couldn't start daemon
Under these conditions, is is still possible to telnet to the printer on port 9100 and print jobs manually. Lpd is still running. Normally, there should be two lpds while a job is printing, and only one otherwise. However, when this bug hits, there are always two.
This is a problem with a socket connection between lpd and the printer. "connect" is an OS function, not a program. No one knows why the second lpd daemon suddenly starts hanging.
Usually, it can be restarted. The following are arranged in order from most to least likely to have an effect. In most cases, the first four will fix the problem.
- Make sure lpd is in fact running.
- Remove any lock files in /var/spool/lpd and restart lpd in /etc/init.d.
- Ping the printer to make sure it's still on the network. Power-cycle every network component between the printer and the server.
- Power-cycle the printer. Sometimes the network port of a printer gets screwed up because of random network traffic or weird packets from outside.
- Stop lpd, wait a few seconds, and restart it; or reboot. The port may be hanging for some reason.
- The behavior of lpd can be checked with strace:
pidof lpd 1758 strace -f -p 1758 2>&1Check for incorrect IP addresses, inaccessible files, etc.
- Remove any lock files in /var/spool/myprinter. Lpd is supposed to delete these automatically, but may not.
- Check permissions in /var/spool, and make sure lpd and lpc look
like the following:
-rwxr--r-- 1 root root 50568 Jan 19 2001 /usr/sbin/lpd -r-sr-sr-x 1 root lp 24764 Jan 19 2001 /usr/sbin/lpc -r-sr-sr-x 1 root lp 15432 Jan 19 2001 /usr/bin/lpq ls -l /var/spool drwxr-xr-x 13 lp lp 4096 Feb 3 2003 lpd ls -l /var/spool/lpd drwxrwxrwx 2 root root 253 Dec 8 08:52 hpbw ls -l /var/spool/lpd/hpbw -rwxrwxrwx 1 root root 0 May 20 2002 control.hpbw -rw-rw-rw- 1 root root 0 May 20 2002 errs -rwxrwxrwx 1 root root 9479 May 20 2002 filter -rw-rw-rw- 1 root root 18 Dec 8 08:52 lock -rw-rw-rw- 1 root root 26 Dec 8 08:52 status cat status sending to 18.104.22.168
- Check for errors in /etc/printcap.
- Reinstall lpd or upgrade to lprng.
- Throw computer out the window, or shoot it with an AK-47 assault rifle, and then quit your job and become a monk (do this only as a last resort).