How do I specify more than one category?

I would suggest using category slugs instead of ids. Please try something like this:

if ( ! in_category( array( 'bunnies', 'tacos', 'banana-pirates' ) ) ) {
    comments_template();
}

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)