managing access to database

Hi to all,

i've seen this is a popular topic but haven't found any concrete answers so
far.
So my scenario is this :

- created a new user with :
sudo -u postgres createuser -D -A -P john

- created a new database with :
sudo -u postgres createdb -E 'UTF8' -O john test

- added plpgsql
sudo -u postgres createlang plpgsql test

After that i wanted to allow "external" access to the "test" database.
So i tried configuring the pg_hba.conf file.
In my first attempt i added this line to pg_hba.conf:
host    all     john   0.0.0.0/0               md5
And john had connect access to access to all databases and admin access to
his "test" database.

After that i wanted give john admin access to his "test" db, and absolutely
no access to other databases.
host    test    john   0.0.0.0/0               md5

It doesnt work. Can't login through pg_admin.
I've played with revoking access to other databases, but to no avail.

I'm quite positive i'm not the first one with this issue.
There is a similar

http://postgresql.1045698.n5.nabble.com/Extended-security-restriction-to-any-role-with-login-access-td2089118.html#a2089128
thread  on the matter..

Any help would be very appreciated.

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