Cant acces to webmin after i change my ip

I change my isp and my ip was changed. I modify in miniserv.conf my new ip , i /etc/webmin/stop and /etc/webmin/start . After i log in with root and password on https://serverip:10000 i recive this error:
Error - Access denied for x.x.x.x for root

For anyone else running across this, this was also opened as a bug report here: