最可能的问题是这一行:

Most likely problem is this line:

AuthUserFile /.htpasswd 

这一行应该提供密码文件的完整文件系统路径，例如

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

AuthUserFile /var/www/.htpasswd 

要发现您的文件系统路径，您可以创建一个包含

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

echo $_SERVER['DOCUMENT_ROOT'];