Can connect w/ Pidgin, not with Psi

I can connect to our Openfire server using Pidgin (which lacks group chat) but not with Psi. In Pidgin, I can message other people who are logged in, but I cannot browse to the chat room, so I want to get Psi working.

In pidgin, my settings are:

screen name: reubenf

server: theserver.domain.org

resource: Conference

advanced/Require SSL

In psi, my settings are:

jabber id: reubenf@theserver.domain.org

connection/Use SSL

misc/Resource: Conference

When I try to connect via Psi, I get the server certificate, but then authentication fails. Any idea on how I can debug this?