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Do you see "localhost" in the URL, instead of the IP address (or hostname) of your Nagios XI server? If this is the case, try the "workaround", posted here: https://support.nagios.com/forum/viewtopic.php?f=16&t=50474&p=263457&hilit=+sla#p263457 Basically, you need to...

What are you trying to monitor? Try using this command instead: ./check_snmp_storage_wizard.pl -H <HOSTNAME> -C public --v2c -m "Physical" -T pl -w 10 -c 5 -f Output: Physical memory: 79%left(1450MB/1840MB) (>10%) : OK | 'Physical_memory'=390MB;1656;1748;0;1840 https://support.nagios.com/k...

That will set the freshness check to 5 seconds. It will only change the services which have check freshness set to on.

The default behavior is for services to stop notifications if their host is down. What version of Nagios XI do you have? Any recent upgrades? When you have a host go down, do all of its services send notifications before the host down notification comes through? And do the services continue sending ...

You can accomplish this by increasing the max check attempts. Go to Configure > Core Config Manager > Services Then open the relevant service and click on the Check Settings tab. These are the relevant setting: Check Interval: The number of minutes between regularly scheduled checks of the host/serv...

The free license is limited by the number of hosts, max of 7, and no support. It is a fully functioning license so the API will still work.

Are you able to do an snmpwalk to that IP?
It's possible you have a firewall issue even if nmap says otherwise.

Do you have it enabled in the UI? Go to Admin > System Information > Monitoring Engine Status and make sure that Flap Detection is disabled.

This will only warn you if your check is ≥ 89 and ≤ 90.

More on thresholds and ranges:
https://nagios-plugins.org/doc/guidelin ... HOLDFORMAT