This article applies as of PRTG 22

Mini probe connections without SSL

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 would transfer passwords that are probably unencrypted.

Note: It is important that all connections are encrypted between the PRTG core server 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.

Note: Always back up your system before you make changes to 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 MiniProbeSSL and select Modify…. In the value field, enter 0. Confirm with Ok.
   Note: The value 1 sets SSL to be required for mini probes.
4. Restart your PRTG core server to activate the settings.

Your mini probe is now able to communicate with your PRTG core server without SSL.