pfSense

Ohhh... as soon as it selects a sane peer, the problem goes away.
Now I don't know if the problem is "Outlier" or if the problem is IPv6 addresses.

affected version also 2.5.0
Candidate 192.168.10.200 .GPS. 1 u 28 64 17 0.187 -0.436 0.048
Candidate 172.17.0.100 192.168.10.200 2 u 25 64 17 0.971 -0.111 0.065
Active Peer 2001:470:26:5dc .GPS. 1 u 21 64 17
^ address truncated
ntp widget
Sync Source 2001:470:26:5dc:ffff:ffff:ffff:fffe (stratum )

ntp_status.widget.php line 41 -> exec("/usr/local/sbin/ntpq -pn -w $inet_version | /usr/bin/tail +3", $ntpq_output);

the problem is with the -w flag

[2.5.0-DEVELOPMENT][root@pfSense.kiokoman.home]/root: /usr/local/sbin/ntpq -pn -w | /usr/bin/tail +3
+192.168.10.200 .GPS. 1 u 24 64 377 0.272 -0.042 0.016
-172.17.0.100 192.168.10.200 2 u 7 128 377 1.053 -0.160 0.069
*2001:470:26:5dc:ffff:ffff:ffff:fffe
.GPS. 1 u 13 64 377 0.279 -0.079 1.379
0.it.pool.ntp.org
.POOL. 16 p - 64 0 0.000 +0.000 0.002
+185.19.184.35 193.204.114.233 2 u 15 64 377 18.030 +4.095 0.364
+212.45.144.3 193.204.114.232 2 u 66 64 377 18.574 +4.374 5.044
+46.235.141.130 85.199.214.99 2 u 7 128 377 31.823 +5.108 0.114
+212.45.144.88 193.204.114.233 2 u 2 128 377 18.133 +2.920 6.557
+85.199.214.99 .GPS. 1 u 7 64 377 46.107 +6.538 0.497
+162.159.200.1 10.39.8.8 3 u 9 128 377 17.660 +3.786 0.506

the regexp at line 48 does not match

without -w the address is truncated but regexp work and show the right stratum
Sync Source 2001:470:26:5dc (stratum 1, .GPS.)

introduced by Do not truncate IPv6 addresss in NTP widget (Bug #4815)

Also NTP status page shows truncated IPv6 address

from ntpq(1):

 -w, --wide
         Display the full 'remote' value.

         Display the full value of the 'remote' value.  
         If this requires more than 15 characters, display the full value, emit
         a newline, and continue the data display properly indented on the next line.

This PR fixes both issues:
https://github.com/pfsense/pfsense/pull/4223

tested it, work partially

NTP status page is wrong for me the table is shifted of 1 place after the long ipv6 address

NTP widget show

2001:470:26:5dc:ffff:ffff:ffff:fffe (stratum .GPS.)

you can see refid .GPS. but stratum is empty

keep up the good work viktor, you have all my esteem for your hard work !

Thanks for testing!

Can you show 'ntpq -pn -w' output?

We've hit that newline issue before with ntpq output -- see #4815

Probably will break more than it helps by adding -w in situations where it forces a newline, but perhaps we can find a regex or similar way to parse the output which mitigates that.

Latest commit appears to work even for the peer on the last line. Thanks

yup work ok with my long ipv6 address too