There is "quick fix" explained for the issue further down, but before proceeding with that, it would be great if someone could perform a few tests -especially when the issue occurs with the PRTG server's own local probe- and provide us the result, so we can find the root reason for the issue that occurs in some installations:
Please download this connection tester for a few quick tests.
Instructions:
- Unzip into a folder of the affected machine (keep the cert subfolder and all files)
- Start PRTGConnectionTesterServer.exe
- Click "Start"
- Start "PRTGConnectionTesterClient.exe"
- Click "Start"
- Server should now show something like this:
19.11.2019 10:36:04 Start
19.11.2019 10:36:04 GID: {9E52E810-512B-467C-A483-3B61CF26CA42}
19.11.2019 10:36:04 (20312) SetActive 1
19.11.2019 10:36:11 (9936) Connect from [127.0.0.1]:58324
19.11.2019 10:36:11 BeforeSSL: 127.0.0.1
19.11.2019 10:36:11 (9936) Version=5678
19.11.2019 10:36:11 CheckPassword IP:127.0.0.1:58324 GID:{C38E81A9-0A56-4423-9E55-3B35DF456EC7} Hash:1234 Version:5678
19.11.2019 10:36:11 (9936) Pass ok
19.11.2019 10:36:11 (9936) Send GID: {9E52E810-512B-467C-A483-3B61CF26CA42}
19.11.2019 10:36:11 (9936) Login OK
19.11.2019 10:36:11 Connect {C38E81A9-0A56-4423-9E55-3B35DF456EC7}
So far, so good, next steps:
- Click "Hello World" on the client
- Client and server now should show some new sent and received messages
- Stop server and client
- Repeat above but disable the "Use SSL" checkbox before clicking "Start"
- Now copy the log content of Client and Server (right click to select all and copy) and send it to us by email ([email protected])
The aforementioned "Quick Fix":
The issue is related to software component "NPCAP" that comes along with PRTG and also received an update, it can be uninstalled manually from "Installed Programs", but it won't uninstall properly as long as "PRTG Probe" is still running. If you can't kill "PRTG Probe" manually:
- Open services.msc
- Double-click "PRTG Probe" and set Startup-Type to "Disabled", then reboot.
- After that you should be able to uninstall NPCAP
- Make to sure to set Startup-Type for "PRTG Probe" again to "Automatic".
- I would recommend to do another reboot, then probe service should work again.
Kind regards,
Erhard
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