PGP KeyServer Communication through FW?

["Jeremy D. Zawodny" <zawodny @ hou . moc . com>]

The documentation for PGP (the new version 5.0) doesn't explain how public
keys are sent between my PGP client and the public KeyServer.  Right now,
it doesn't work, and I'm pretty sure that's because of our Firewall.

So, does anyone know which port/protocols/etc PGP 5.0 uses for
communicating with its KeyServers.

Jeremy