What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

How to use a SSL certificate




I'm trying to use our own SSL certifivate but I had no luck yet. Our certificate came along with the following files:

  • AddTrustExternalCARoot.crt
  • COMODOHigh-AssuranceSecureServerCA.crt
  • prtg_tmts_nl.crt

I looked here https://kb.paessler.com/knowledgebase/en/topic/283-how-can-i-use-a-trusted-ssl-certificate-with-the-prtg-web-interface

But I don't know how to decrypt the .key file. I tried copying the files I had, after renaming them first, but when I tried to relaunch prtg, it simply won't run.

Any suggestions on how to proceed?

Your Sincerely,

Michel Butzelaar

certificate prtg ssl

Created on Jun 3, 2013 1:23:42 PM

Last change on Jun 4, 2013 12:49:44 PM by  Daniel Zobel [Product Manager]

1 Reply

Accepted Answer



Dear Michel,

So, one of your files must be the root certificate, one the server certificate and one the private key file.

>But I don't know how to decrypt the .key file.

The issuer of your certificate has sent you the encrypted private key file along with a password. Please use the private key file in combination with the password to generate another private key file which is not encrypted:

  • Download openssl.
  • On command line, run: openssl rsa -in [encrypted-key].key -out prtg.key
  • At the "Enter PEM pass phrase:" prompt enter the password for the key

Please make sure your certificates and key files are PEM encoded. Use SSL converter tools, if necessary.

Created on Jun 4, 2013 1:03:42 PM by  Daniel Zobel [Product Manager]

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.