Dear @aubergine, @Jens and @ntppool,
What you see as a problem with the monitoring server itself is a network issue. There are servers even across the Atlantic ocean from Newark which never shows failure, for example: https://www.ntppool.org/user/cp8t2gudho2eojnkjni . If the outbound packets from the monitoring server takes the NTT network, this network sometimes drops the packets. Other networks do not have this malicious behavior. The details of the founding of that serious network problem is here: Holy assymetrical routes, Batman! Is this an as7012.net routing issue?
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