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Zabbix: active check configuration update from [linsrvj01.nix.mds.xyz:10051] started to fail (cannot connect to [[mickey-mouse01.disney.land]:10051]: [111] Connection refused)

You are here because you are getting:

Zabbix: active check configuration update from [linsrvj01.nix.mds.xyz:10051] started to fail (cannot connect to [[mickey-mouse01.disney.land]:10051]: [111] Connection refused)

likely because of SELinux / Auditd:

/var/log/audit/audit.log
type=AVC msg=audit(1550015414.857:191): avc:  denied  { write } for  pid=2030 comm="rpc.statd" path="/run/rpc.statd.lock" dev="tmpfs" ino=19053 scontext=system_u:system_r:rpcd_t:s0 tcontext=system_u:object_r:var_run_t:s0 tclass=file

and are probably looking to solve the problem using:

grep AVC /var/log/audit/audit.log* | audit2allow -M systemd-allow;semodule -i systemd-allow.pp

Run the above a number of times until the denied messages stop flowing into the audit.log file.

Rgds,
TK

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