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Error HTTP/1.1 404 Not Found after update Fortigate

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HTTP sensor send error HTTP/1.1 404, any idea what happen?

404 fortigate http prtg

Created on Jun 26, 2021 1:26:03 AM by  adminjoe (0) 1



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Are you able to open the URL in a browser (on the same system as the Probe that runs the sensor)?


Kind regards,
Sasa Ignjatovic, Tech Support Team

Created on Jun 30, 2021 7:39:51 AM by  Sasa Ignjatovic [Paessler Support]

Last change on Jun 30, 2021 7:40:03 AM by  Sasa Ignjatovic [Paessler Support]



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Hi, yes , the URL open in probe server, port usage from url is: https://name.myfirewall:44435, can be problem a port not standard?

Created on Jul 5, 2021 12:34:24 PM by  adminjoe (0) 1



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The sensor should still work. Did you enter the URL in the sensor including the port (so: https://name.myfirewall:44435)?


Kind regards,
Sasa Ignjatovic, Tech Support Team

Created on Jul 6, 2021 9:08:42 AM by  Sasa Ignjatovic [Paessler Support]



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I had the same problem. It seems like after a fortigate update, when acessing the URL "https:///Fortigate-Firewall/" there is a HTTP-Redirection and the PRTG Sensor does not follow the redirection, instead issuing a Error HTTP/1.1 404 Not Found.

The Workaround is to change the URL to "https://Fortigate-Firewall/login" then the sensor is OK again.

Created on Sep 28, 2021 12:36:23 PM by  skyraven (60) 1 1



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