[ntp:questions] Sure GPS - Very High Jitter and Offset

Ken Link klink at numberzero.org
Sun Aug 14 01:12:38 UTC 2011

Following up on my previous posts...

I compiled NTP 4.2.6p3 on my Ubuntu server (with the NMEA refclock
enabled, debugging enabled and linuxcaps enabled) but I'm getting
Permission Denied when it tries to access /dev/gps0 (symlink to
/dev/ttyS0). I saw from searching that someone fixed it by disabling
SELinux, but I don't have it installed.

Command line: /usr/sbin/ntpd -p /var/run/ntpd.pid -g -u ntp:ntp -d
..."refclock_open /dev/gps0: Permission denied"...

# ls -al /dev/ttyS0
crw-rw---- 1 ntp ntp 4, 64 2011-08-13 19:20 /dev/ttyS0

# ls -al /dev/gps0
lrwxrwxrwx 1 root root 5 2011-08-13 19:06 /dev/gps0 -> ttyS0

Any ideas?

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