[isf-wifidog] reset Auth_server. I can't access on wifidog portal

[Andrea Franchiolo]

Hi at all,
my named is Andrea and i try wifidog captive portal in my university 
college.
I've a debian server with PDC samba with backend LDAP.
i've change type Auth_server in LDAP mode by admin mode on wifidog 
portal. But the pc shutdown.
Now i can't access on wifidog portal.
This error:"Error while connecting to the LDAP server.", when i insert 
admin password
I want set Auth_server for login in wifidog portal.
How to change type Auth_server now?

Thanks a lot
Andrea