what permissions miniBB files should have

what are the permission setting for all those files?
755?
666?
document does don't mention!

thanks

We are not using files for writing, so reading permissions for all groups are enough.

how about directories? 777?

The same for directories.

Reading permissions for all groups wold be 444??

744 should be enough for everything (except for "shared_files" folder, if you're using some files-based add-ons).

I had to find out that for the folders (img, forum_icons, lang, templates) you need to set permissions of 755. If you use 744 the forum will not be displayed correctly. Files inside the folders can't be read in such a case because to read a file in a folder you have to execute folder - reading it won't do (at least that's what it seems like according to my observations).

Thanks for addition; I think any good hosting should be pre-configured to run miniBB without any special action. I.e. when you upload these folders/files on the server, they must be ready to go automatically. This is what a "good" server means, at least it works in my practice. If you need to set up specific folder permissions during basic setup, I would recommend to think if it's a really stable hosting server.