PGAdmin connection failure

Hi hope you can help,
I'm running Postgres on an OSX machine, all hunky dory and fine. The
problem comes when I try to connect to the databases through PGAdminII
(on a Win2K machine) I get the following error:-

Unable to connect to Ident server on the host which is trying to connect
to Postgres (IP address xxx.xxx.xxx.xxx, Port 113). errno = Connection
refused (61)

I've authorised the subnet that the connecting host is on to access the
Postgres server and set up the following user mappings:-

Map User Ident

postgres postgres postgres
admin admin admin

I've also created the user 'admin' in the database I'm trying to
connect to, still no joy. The ODBC component has been configured. I
tried using an SSH tunnel with local forwarding to connect and got
exactly the same error.

Any light you could cast on this would be much appreciated.

Cheers,

Rob Caulfield.