Unable to login into Nagios server from nagmon

Magmon will not login into my local Nagios server. Aka ‘unable to connect’

Nagios: 4.5.11

URL works from chrome, aka host name, which resolves, path, user id/password, not using https, as local network. Appending status.cgi, brings up the status page as it should.

John

John

May 16, 2026 2:01 AM

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rv400

Jul 14, 2026 10:15 PM

Hi John, thanks for the detailed report. A few things to check. The most common cause of this is the path field: NagMon needs just the base path of your Nagios web interface, for example nagios, and it builds the rest of the URL itself. It also talks to the JSON CGIs rather than the
classic pages, so a good test from Chrome is to load http://yourhost/nagios/cgi-bin/statusjson.cgi?query=hostlist with the same credentials. If that returns JSON in the browser, NagMon should be able to talk to it, since Nagios 4.5.11 includes the JSON CGIs. If you entered a full
URL ending in status.cgi or cgi-bin, trim it back to just the base path and try again.

Two more things worth checking since this is a local network server. Make sure your iPhone is on the same Wi‑Fi network and that the hostname actually resolves on the phone itself; short internal hostnames often resolve on a desktop but not on iOS, so trying the server's IP address
instead of the name is a quick way to rule that out. A