Yes. No problems with survey activation.

We will try to research this suhosin. However, problems regard only the big sub-questions survey.

Thanks!
M.

What is the server setting you currently have the problems with?
-OS, Hardware, Hosting provider, etc.
-what is the limesurvey version on this server?

And what is this "hosting service" you are talking about?
-OS, Hardware, Hosting provider, etc.
-what is the limesurvey version on this server?
-what is the difference between the "server" and the "hosting service"? Help us to help you by providing as much information as possible. At the moment this is like pulling teeth.

Not suhosin now, but max_input_vars : surely this here.

max_input_vars is to 40 000 (sic!). Default was 1000 than we changed to 2000, next 4000 and finally 40 000. No changes at all

Thank you so much for the great community suport. We had to buy a full hosting for the survey from LimeSurvey, so the problem is not urgent now. We will try to solve it for potential future adoption.

With 10000 it can't be max_input_vars, something other .

Do you have access to the server log ? If yes : do the action with tail the webserver error log.
Then you have the information , then the way to fix it.