The time on the GW needs to be correct for the TLS handshake to work. Unfortunately, the GW does not have a battery backed up RTC, but relies heavily on NTP server connection.
By default the NTP connection is to an NTP pool, the pool returns a "random" NTP server for the GW to use for this to work NTP traffic (UDP 123) need to be open towards ALL destinations.
You can check the current time on the gateway by performing:
SSH admin@xxx.xxx.xxx.xxx (x=GWs ip)
The PW can be found on the info sheet provided with the GW packaging.
Once logged in, use the command "date" to display the current time.
If not correct you can specify your own NTP server by editing the file /etc/ntp.conf .
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