connection in pgadmin3 not resolving host

ok i've searched all over and i know this has been
asked before. but the solution is not working and i'm
unclear on how to debug it.

in pgadmin3 i keep getting:

Could not resolve hostname
jdbc:postgresql://127.0.0.1:5432/postgres

and yet from the command line i can log into psql. i'm
running ubuntu 6.10. i have put this jdbc driver:

postgresql-8.1-408.jdbc3.jar

into my /usr/bin directory.

and i've tried every combination of localhost,
jdbc:postgresql:postgres and tons more for the
connection string.

any ideas on what to try next, or how i can debug
this?

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