problems connecting remote postgresql server

We've recently installed postgresql8 in windows, created a database and
started the service from start menu. We are using pgadmin.

Then we want to connect to it from another windows machine from pgadmin
also, but we get this error:

"Ha ocurrido unerror:
could not connect to server: connection time out...
Is the port opened...?"

Or something like this.

We think the problem doesn't reside on firewall, because we've been able to
open ports for another appications in this machine and connect to them
remotely.
What's the problem? Anyone can help me, please?

Thank you in advance.
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