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SSL Certificate Sensore - Failed to establish secure connection

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Some of our SSL Certificate Sensors show the error: Failed to establish secure connection [Step 0] Socket Error # 10061 Connection refused. [Step 1] Socket Error # 10061 Connection refused. [Step 2] Socket Error # 10061 Connection refused. [Step 3] Socket Error # 10061 Connection refused. [Step 4] Socket Error # 10061 Connection refused. [Step 5] Socket Error # 10061 Connection refused.

Sometimes they are okay (Green) and sometimes they are showing this error. Other sensors are permanetly showing this error. Is it possible that something with the network or the used credentials isn't corrent?

Thanks for your help!

sensors ssl ssl-certificate

Created on Jan 31, 2018 10:01:07 AM by  lwidmer (0) 1



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Dear lwidmer,

the long error message with different steps shows that the sensor cycles through different SSL protocols, each one resulting in an error. Possible error causes include a wrongly entered device address (must be IP or DNS name, without the "https://" part.) Also, network connectivity issues are a possible cause.

Created on Jan 31, 2018 2:30:17 PM by  Arne Seifert [Paessler Support]



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The device address is entered correctly and i don't think its a network connectivity issue, because other sensors on the same server are running. Does this error also show up when there isn't a ssl certificate?

Created on Feb 21, 2018 2:06:12 PM by  lwidmer (0) 1



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Dear lwidmer,

Yes, if there is no SSL certificate this error message can be displayed (i.e. if the server only accepts unencrypted connections). Are you able to connect from your PRTG to the corresponding sites via browser? Please check this when the Sensor is in error state. Please also send a configuration report to [email protected] with the subject PAE999359. A configuration report can be created via the blue printer icon on the top right of the sensor settings.


Kind regards,
Birk Guttmann, Tech Support Team

Created on Feb 22, 2018 2:54:16 PM by  Birk Guttmann [Paessler Support]



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Same here, was this ever solved? HTTPS Sensor works well on this external Webserver, but SSL Certificate Sensor directing to the same device is getting the error:

Failed to establish secure connection [Step 0] Socket Error # 11001 Host not found. [Step 1] Socket Error # 11001 Host not found. [Step 2] Socket Error # 11001 Host not found. [Step 3] Socket Error # 11001 Host not found. [Step 4] Socket Error # 11001 Host not found. [Step 5] Socket Error # 11001 Host not found.

Created on Dec 3, 2018 10:44:26 AM by  wayne7215 (50)



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Hello there,

Please check the corresponding certificate with the browser on the PRTG server. Is it displayed correctly there?


Kind regards,
Birk Guttmann, Tech Support Team

Created on Dec 6, 2018 1:08:55 PM by  Birk Guttmann [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.