Can't access admin - 503 service unavailable

Silverstripe Version: 4.8

Question: I’m updating my website from 3.x to 4.8, just keeping the database.
On my local machine (installed via composer) everything is ok.
On production (installed via softaculous) dev/build is ok but I’m not able to acces to admin.

I go to
and I got this message :
Service Unavailable
The server is temporarily busy, try again later!
No login form.

But the website is ok, I can see all the pages.

Any idea ?

So my conclusion. SS4 installation via Softaculous (and even via FTP) doesn’t work.
I tried 3 times and impossible to access to the admin panel.

Installing SS4 via composer worked at the first time…

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