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Why does my browser show an SSL certificate warning when I open the PRTG web interface?



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When I open the PRTG web interface, I get an SSL certificate warning in my browser. What does this mean?

browser prtg ssl-certficate-warning ssl-tls

Created on Sep 28, 2021 9:36:05 AM by  Maike Guba [Paessler Support]

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This article applies as of PRTG 21

SSL certificate warning in browsers

If you use PRTG Network Monitor outside your internal LAN, particularly if you use it on the internet, make sure that you secure connections to the PRTG web server with SSL/TLS. Your browser then shows an SSL certificate warning when you open the PRTG web interface because PRTG comes with a self-signed certificate. The connection to your PRTG web server is still secured with SSL/TLS and you can confirm the supposed security risk.

Every browser shows a different SSL certificate warning that you need to confirm before you can proceed.

Google Chrome

In Chrome, click Advanced, then click Proceed to <yourPRTGserver> (unsafe) to confirm the SSL certificate warning.

SSL certificate warning in Google Chrome
Click to expand.

Mozilla Firefox

In Firefox, click Advanced, then click Accept the Risk and Continue.

SSL certificate warning in Mozilla Firefox
Click to expand.

Microsoft Internet Explorer

In Internet Explorer, click Go on to the webpage (not recommended).

SSL certificate warning in Microsoft Internet Explorer
Click to expand.

The procedure is similar for other browsers that PRTG does not officially support.

How to avoid SSL certificate warnings

You can avoid the browser warnings if you use your own trusted SSL certificate with PRTG. For this purpose, use the free Paessler tool PRTG Certificate Importer to automatically import your certificate files. You can also manually import your certificate files. For more information, see How to use your own SSL certificate with the PRTG web server.


Created on Sep 28, 2021 9:56:54 AM by  Maike Guba [Paessler Support]

Last change on Sep 28, 2021 11:26:47 AM by  Maike Guba [Paessler Support]

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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.