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

David Woolley david at ex.djwhome.demon.invalid
Fri Aug 19 20:43:28 UTC 2011

unruh wrote:
> On 2011-08-14, Ken Link <klink at numberzero.org> wrote:

>> /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
> So try making it rw for all and see if that helps.

SELinux is a discretionary security add-on to the filesystem introduced 
by Red Hat.  It can prevent access even when the traditional Unix file 
modes are wide open.

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