webuzo nginx as reserve proxy, htaccess doesn't work?

i'm using webuzo and using apache+nginx reserver prox...i have set up nginx reserve proxy on nginx setting with port 81 and "check" allow .htaccess i have restarted nginx, apache and all but my htaccess doesn't work ..when i use apache as my my webserver, htaccess work fine

what additionat setting should i do to make my htaccess working on nginx as reserve proxy?