Ok, just changed it - but when I click on "Next" to start the setup routine I get the following:
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Fatal error: eZ publish did not finish its request
The execution of eZ publish was abruptly ended, the debug output is present below.
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Unfortunately I don't find any helpful solutions for this problem on the internet and now I'm not able to come back to the setup dialogue... Moreover I don't get any debug message - there's only a white screen and the error message.