Troubleshooting – Network PCs Cannot Sync
In order for clients on the network to be able to sync to NetClock, several requirements must be met:
- The PC(s) must be routable to NetClock. Make sure you can access NetClock Web UI from a PC that is not syncing. If the PC cannot access the Web UI, a network issue likely exists. Verify the network configuration.
- The network clients have to be configured to synchronize to NetClock's address. For additional information on syncing Windows PC's, see http://support.spectracom.com/articles/How_To/Synchronizing-Windows-Computers. The last section of this document also contains troubleshooting assistance for Windows synchronization. For UNIX/Linux computer synchronization, please visit http://www.ntp.org/.
- If at least one PC can sync to NetClock, the issue is likely not with NetClock itself. The only NetClock configurations that can prevent certain PCs from syncing to the time server are the NTP Access table and MD5 authentication. See Configuring NTP Symmetric Keys. A network or PC issue likely exists. A firewall may be blocking Port 123 (NTP traffic), for example.
- NTP in NetClock must be “in sync” and at a higher Stratum level than Stratum 15 (such as Stratum 1 or 2, for example). This requires NetClock to be either synced to its input references or in Holdover mode. Verify the current NTP stratum level and the sync status.