what is the setting if change from http to https?

I think the best suggestion I could give is start googling a bit and read some tutorials.

The simple answer is you don't have to change any settings in directadmin to change your website from http to https. You just have to install a certificate (and probably make some changes in the code of your website).

In case it's not about your website but Directadmin, please let us know what your goals is so the question is a bit more clear. What is your current setup? There are already a few manuals on the forum available.

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