Vaisala AP10 Guía Rápida página 11

Troubleshooting NTP connections
AP10 must maintain accurate time by synchronizing with a Network Time Protocol (NTP)
server. If AP10 does not have accurate time, it shows the messages Not connected to NTP and
VaiNet radio off on the home screen. AP10 will not connect any data loggers or transfer any
data through VaiNet radio until it is able to synchronize with an NTP server again.
Go through the possible causes of NTP connection problems in the following order. You may
need help from your local IT support unless the problem is a simple network connection or
configuration issue.
1. Make sure AP10 is connected to the network:
a. Check that the Ethernet cable is connected to AP10, and the network activity LEDs on
the connector are lit (indicating an active connection).
b. Check the current network settings from Settings > Network. If you are unsure,
confirm the settings from your local IT support. It may also be necessary to register
the MAC address of the AP10 to the network so that it can join. The MAC address is
written on the front of the AP10 near the Ethernet connector.
c. Check that AP10 shows the appropriate IP address on its home screen. The message
Not connected to network must not be shown.
2. Verify the NTP servers listed in the Settings > NTP screen. By default, there are four
numbered pool.ntp.org servers listed (for example, 0.pool.ntp.org).
If you have replaced a default server with a local NTP server, make sure its address is
written correctly. If the address of the local NTP server is a hostname (for example,
myntpserver), make sure it is registered with the DNS server AP10 is using. Instead of
the hostname, you can also try to provide a fully qualified domain name (for example
myntpserver.corporate.net) or the actual IP address of the server.
3. A firewall may be blocking UDP port 123 that is needed for the NTP protocol to function.
Typically this happens on the edge of the network. Both inbound and outbound
connections must be allowed.
If you have set up a local NTP server, make sure the firewall on the server itself is not
blocking the NTP connections.
4. There may be a network routing problem. The most typical case is an isolated network
with no access to Internet, which means the default NTP servers are not reachable. In an
isolated network, you must provide a local NTP server or AP10 cannot be used.
Depending on your geographical location, the default NTP servers may be
unreachable even if the access point has Internet access and the firewalls of your
local network are not blocking the NTP connections. In that case, you should
reconfigure the NTP server list to use country-specific servers. For example, you
could use 0.ch.pool.ntp.org if the access point is installed in Switzerland.
For lists of available server addresses, see www.ntppool.org.
For other troubleshooting instructions, see AP10 User Guide (M211860EN)
available at www.vaisala.com/ap10.
Accessing the web interface
Touchscreen interface may be difficult to access after AP10 has been installed. AP10 also has a
web interface that you can use to remotely view access point status and configure its settings.
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