Is there a firewall enabled on knoppix? Is anything being blocked by default? or is it wide open?

Reason I ask is I have to pc's on my network. Both are behind a router.

PC1 (windows) can connect to a citrix ts (gets list of published applications)
PC2 (knoppix) can connect only if I put in an ip address. If I ask for a list of published applications it says it can't see the master browser.