Are you sure that's about your MySQL server? I believe ISPConfig is asking for the host.domainname.tld of where you're going to install ISPConfig.
So, let's say your domain is example.com. In that case, you'd enter "www" for the first entry (unless you want to use an unusual host name), and then "example.com" for the second prompt.
Sorry if this seems like a very odd question.
Don't worry about it. The text for each of those prompts in that question-answer sequence is a little vague and non-descriptive.
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