Hello,

We are trying to install PRTG on a server on secure network (no internet connection allowed). We tried the offline activation and received error: Failed to establish secure connection: Socket error 11002 - offline activation of license.

If i change something in the key it says that the key is incorrect so it does know when it's correct and when it's not. what is the procedure to solve this issue. We are using the latest version that we downloaded from this site (i believe its version 18).

let me know if you need more information.

At the moment this is a free trial key for a customer that wants to start monitoring his network, if he likes the test he will most likely purchase a license, but first we need this to work..

Article Comments

Hi there,

Are you using IE11 by any chance? Kindly try another browser, as we're currently seeing this issue only with IE11.

Let me know if it worked!

Kind regards,
Stephan Linke, Tech Support Team


Mar, 2018 - Permalink

Hi Stephan,

worked like a charm :) (took us some time to get the proper clearance to install firefox on that device, hence the slow reply).

Thank you very much, have a nice day.


Mar, 2018 - Permalink

Hi there,

Glad it's up and running now :)

Kind regards,
Stephan Linke, Tech Support Team


Apr, 2018 - Permalink

I am using the Firefox in which I am also getting the same error


Mar, 2020 - Permalink

Even when placing the activation.dat in the corresponding directory?


Mar, 2020 - Permalink