Fix Wrong Time on the Hub
Troubleshoot - NTP Server unreachable
Network Time Protocol (NTP) requires connectivity with an external NTP time server. Pulse HUB and Remote Extender NTP services operate on UDP port 123.
For NTP to operate correctly, UDP port 123 needs to be open.
If you can see the following information message this indicates the outbound UDP port 123 is blocked on the HUB.
![Pulse_NTP_server_unreachable_notification.png](/content/dam/graco/vhes/images/pulse-pro-support/Pulse_NTP_server_unreachable_notification.png)
We do not provide steps for addressing this as it is entirely dependent on the configuration of the network the HUB is operating on. This must be done by the IT person at the location.
Time Servers
Pulse HUB default time servers:
pool.ntp.org - a virtual cluster of timeservers
Remote Extender default time servers:
NTP server 1: 0.time.digi.com
NTP server 2: 1.time.pool.ntp.org
NTP server 3: 1.idigi.pool.ntp.org
NTP server 4: 2.idigi.pool.ntp.org