[chrony-users] UDP port123 blocked

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To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: [chrony-users] UDP port123 blocked
From: deon <deon@xxxxxxx>
Date: Tue, 28 Jun 2022 18:19:05 +0200
Authentication-results: ucebox.co.za; auth=pass smtp.auth=154.0.171.186@xxxxxxxxxxxxxxxxxxxx
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Wanted to get a server answering NTP requests but using the internal RTC as a time reference as discussed in the Chrony docs. Could not get it to work.

Scenario: Rocky 8.5 OS on old Intel server with Chrony version 4.1 (+READLINE +SECHASH +IPV6 +DEBUG). Testing with a Linux Mint laptop.

When testing with ntpdate -q 123 192.168.100.10 gave message:

no server suitable for synchronization found

After digging around with the Chrony conf file and getting nowhere, I found in the mailing list some hint to test:

mtr -u -P 123 192.168.100.10

Keys: Help   Display mode   Restart statistics   Order of fields   quit
                                                                                                                Packets               Pings
Host                                                                                                         Loss%   Snt   Last   Avg Best Wrst StDev
1. (no route to host)

Eliminated the usual suspects: Firewall (iptables) on both sides are off. I can ping interfaces from each other.

Chrony reportedly runs:

@localhost ~]$ systemctl status chronyd

● chronyd.service - NTP client/server
   Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor pre>
   Active: active (running) since Tue 2022-06-28 10:22:57 EDT; 1h 8min ago
     Docs: man:chronyd(8)
           man:chrony.conf(5)
Process: 1180 ExecStartPost=/usr/libexec/chrony-helper update-daemon (code=ex>
Process: 1103 ExecStart=/usr/sbin/chronyd $OPTIONS (code=exited, status=0/SUC>
Main PID: 1115 (chronyd)
    Tasks: 1 (limit: 46109)
   Memory: 1.6M
   CGroup: /system.slice/chronyd.service
           └─1115 /usr/sbin/chronyd

Jun 28 10:22:52 localhost.localdomain systemd[1]: Starting NTP client/server...
Jun 28 10:22:52 localhost.localdomain chronyd[1115]: chronyd version 4.1 starti>
Jun 28 10:22:52 localhost.localdomain chronyd[1115]: Frequency 11278.843 +/- 99>
Jun 28 10:22:57 localhost.localdomain systemd[1]: Started NTP client/server.