NIS 2009 blocks access to external drives from other computers

I have a typical home peer-to-peer ethernet network.  My desktop has an external Maxtor One-Touch II drive connected by a firewire 800 connection.  I share folders on this external drive with other computers on the network.  Once I installed NIS 2009, other computers on my network can no longer access shared folders on this external drive.  They can still access shared folders on my internal harddrives.

 

Has anyone else had the same problem?

 

Is there a setting in the NIS firewall that can be set to permit access to my external drive from other computers on my network?

 

Thanks

DAK1045