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How can I disable SSL for Mini Probes?



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The mini probe that is running on my Android device cannot connect to the PRTG core server. The mini probe reports that it requires SSL. However, I have deactivated SSL encryption on my PRTG core server because my network scenario makes use of other security components.

How can I connect my mini probe to the core server without using SSL connections?

android connection connectivity https mini-probe prtg reghack registry ssl

Created on May 16, 2014 1:17:06 PM by  Gerald Schoch [Paessler Support]

Last change on Jul 26, 2019 12:32:38 PM by  Maike Guba [Paessler Support]

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This article applies to PRTG Network Monitor 19 or later

PRTG Mini Probe connections without SSL

PRTG mini probes require HTTPS connectivity to send monitoring data to your PRTG core server. Mini probes cannot connect when SSL is disabled for PRTG. This is essential for connection security because PRTG will transfer passwords that are probably unencrypted. So it is important that all connections are encrypted between core and probe, even on internal routes.

However, there might be scenarios where full security is ensured in other ways (for example, via VPN). For these cases and to be able to connect with mini probes, there is a registry key option to define SSL as not required. It has to be explicitly set and you need to be fully aware of the effect.

Note: Always back up your system before manipulating the Windows registry!

Steps to take

  1. Open the registry editor and navigate to the following key:
    • On a 64-bit Windows system, navigate to
      HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Paessler\PRTG Network Monitor\Server\Probes\
    • On a 32-bit Windows system, navigate to
      HKEY_LOCAL_MACHINE\SOFTWARE\Paessler\PRTG Network Monitor\Server\Probes\
  2. Create a new DWORD: In the current path, right-click, select New | DWORD Value, and name the new value MiniProbeSSL.
  3. Set the value of MiniProbeSSL to 0 (this means no SSL required): Right-click on MiniProbeSSL and select Modify…. In the value field, enter 0. Confirm with Ok.
    Note: The value 1 will set SSL to be required for mini probes.
  4. Restart your PRTG core server to activate the settings.

Now your PRTG mini probe will be able to communicate with your PRTG core server without having HTTPS connectivity.

Created on May 16, 2014 1:17:27 PM by  Gerald Schoch [Paessler Support]

Last change on Dec 4, 2020 2:10:19 PM by  Brandy Greger [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.