Keep the following command, who knows it would save your day and money someday! ^^

1. To retrieve your unifi pppoe password: http://<router_ip_addr>/model/__show_info.php?REQUIRE_FILE=/etc/ppp/chap-secrets

 

2. To retrieve your unifi router password: http://<router_ip_addr>/model/__show_info.php?REQUIRE_FILE=/var/etc/httpasswd