Check NTP Connection

[ Check NTP connection client to server port 123(UDP) ]

# ntpdate -dv 0.amazon.pool.ntp.org
=== Output ===
host found : 139.59.221.20
transmit(139.59.221.20)
receive(139.59.221.20)
transmit(128.199.84.169)
receive(128.199.84.169)
========================
[sync time with server]
# ntpdate -u 0.amazon.pool.ntp.org
========================
[UDP connection check]
# nc -vu 139.162.60.234 1194
# nc -vu 192.168.1.48 1514
========================