Live Diagnostic Results

[root@system ~]#

Initiating NTP diagnostic scan...

Connecting to reference server...

Time Offset

Network Latency

Sync Status

TESTING

✓ System Check Running

Common NTP Problems Detected

Running diagnostics...

Troubleshooting Checklist

Firewall Port 123 (UDP)

Ensure UDP port 123 is open for NTP communication. Check: sudo ufw allow 123/udp
Complete firewall configuration guide for iptables, firewalld, ufw & Windows →

NTP Daemon Status

Verify your NTP service is running. Check: systemctl status chronyd or systemctl status ntpd
Fix ntpd, chronyd & systemd-timesyncd issues step by step →

Stratum Level Issues

If showing Stratum 16, your NTP daemon has no valid time source. Check server configuration and network connectivity.
Troubleshoot Stratum 16 & no sync source →

False Ticker Detection

Server marked as "false ticker" means time disagreement with other sources. Review /etc/ntp.conf or /etc/chrony/chrony.conf
Understand and fix false ticker issues →

Quick Fix: w32tm & Chrony Commands

Windows (w32tm)

C:\> w32tm /config /manualpeerlist:"pool-ntp.rdem-systems.com" /syncfromflags:manual /update C:\> net stop w32time && net start w32time C:\> w32tm /resync /force Sending resync command to local computer... The command completed successfully.

Linux (Chrony)

root@server:~# chronyc sources -v root@server:~# chronyc makestep 200 OK 200 OK root@server:~# chronyc tracking

Complete w32tm & Chrony Guide →

Free NTP Synchronization Guide

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✓ Complete w32tm configuration for Active Directory
✓ Chrony vs ntpd: which to choose
✓ Firewall rules and network architecture
✓ Troubleshooting Stratum 16 and false tickers

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About check-ntp.net — A free real-time NTP diagnostic service. Queries run directly from the RDEM Systems network and are compared against GNSS/PPS Stratum 1 references for sub-millisecond accuracy. We actively contribute to the NTP Pool project →
See also: Live NTP synchronization tester · NTP server validator for RFC1918
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NTP Diagnostic Tool