Hello!
This is the tcpdump of the DNS traffic seen from the server running monit.
19:00:42.561736 IP 94.237.82.24.54402 > 71.2.236.171.53: 1+ NS? . (17)
19:02:38.357505 IP 94.237.82.24.34137 > 71.2.236.171.53: 1+ NS? . (17)
This is the alert:
----- Forwarded message from [email protected] -----
Date: Sat, 09 Dec 2017 19:00:43 GMT
Connection failed Service spamd
Date: Sat, 09 Dec 2017 19:00:43
Action: alert
Host: web.olmunkaido.hu
Description: failed protocol test [DNS] at [71.2.236.171]:53 [UDP/IP]
-- DNS: error receiving response -- Resource temporarily unavailable
Could it be that monit waits 1 second before reporting the DNS server offline?
Google shows: https://stackoverflow.com/a/2379587/1606933
SZÉPE Viktor, honlap üzemeltetés
https://github.com/szepeviktor/debian-server-tools/blob/master/CV.md
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Budapest, III. kerület
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