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MANUAL P/N 900000165 REV H
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10
Troubleshooting Guide
Here are a few common problems that occur with their likely causes. If these answers do not
help you, then please contact us to help us resolve your problem. Contact details are found in
Chapter 11.
Q
Unable to obtain Time from the server?
A
If the NTP80plus STATUS LED is blue and the display shows Normal, check that you are
using the correct software. Some synchronising software looks for a NTP broadcast
message, if this is the case, ensure the NTP80 broadcast address is configured correctly.
Q
Unable to ‘Ping’ NTP Ethernet module?
A1
If the unit fails to respond to a ping test, check that the TCP/IP address has been
correctly set. Check that the correct interface port has been attached to the network.
Check the Ethernet connection between your NTP80 and Hub or network connection.
The Link LED on your NTP80 Ethernet Port and the corresponding network connection
LED should both be illuminated.
A2
If you have recently changed the NTP80’s IP Address and have been communicating
with the NTP80 across the network then don’t forget to clear the “arp” table for the
appropriate MAC address. This can be implemented by typing arp –d < IP Address > at
the command prompt.
Q
Module does not appear to see NTP packets but works with a ping?
A1
An NTP80 that pings, does not necessarily mean that a client’s NTP requests for NTP
packets will respond. If a firewall is installed between the NTP80 and the Client, check
that the Firewall settings will allow NTP packets to flow in both directions. Confirm that
the Gateway address has been specified in the configuration correctly.
A2
If the unit fails to respond to an NTP packet, try using NTPDATE or a similar program to
establish communication. Check the client machine is able to send UDP packets on port
123 (the defined NTP port number).
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