.htaccess/.htpasswd 500 Internal Server Error

I'm working on blocking a folder with .htaccess, which I've never used before, and I'm having some trouble. Here's what I have

.htaccess (located in the folder I want blocked):

AuthName "Username and password required"
AuthUserFile /.htpasswd 
Require valid-user
AuthType Basic

.htpasswd (located at root, password is encrypted in actual file):

   tim:blah

I'm getting 500 Internal Server errors with this and I can't figure out why.

Most likely problem is this line:

AuthUserFile /.htpasswd

This line should provide full filesystem path to the password file e.g.

AuthUserFile /var/www/.htpasswd

To discover your filesystem path, you can create a PHP document containing

echo $_SERVER['DOCUMENT_ROOT'];

If nothing helped and you're using PHP you can make it work by putting this in your index.php (on top):

if (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
    if ($_SERVER['PHP_AUTH_USER'] != 'user' || 
        $_SERVER['PHP_AUTH_PW'] != 'pass') {

        header('WWW-Authenticate: Basic realm="Protected area"');
        header('HTTP/1.0 401 Unauthorized');

        die('Login failed!');
    }
}

Permissions can cause this issue too.

Make sure .htpasswd is readable by the web server user.

For instance, if you use nginx check the nginx.conf to find out what the server user is, if you use Apache you can find it out this way, etc.

Then set the right owners and read permissions to .htpasswd

If you see 500 Internal Server error these days - it's mostly due to the fact that in newer Apache versions the path in AuthUserFile has to be put inside quotation marks.

AuthUserFile "/var/www/somewhere/.htpasswd"

.htaccess/.htpasswd 500 Internal Server Error

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