The nagios server ip address is suddenly replaced, causing all the machines to be monitored, (only the last two machines survived by writing the nagios domain address)
However, I put the nagios address of the monitored machine After changing to the domain name of the nagios server, nagios still can't be monitored, it is very surprising. What is the reason!
It was later discovered that xinetd took nrpe's 5666 port.
Workaround
# netstat -anp
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