Public shared folder with samba in domain mode
 

I have samba configured with security=domain, and everything's been working perfectly. However, now I need to share a single folder that does not require password authentication. I've tried adding the following, but it still asks for a username and password every time:

[Public]
path =<path to folder>
writeable = yes
guest ok = yes
browsable = yes
public = yes
guest account = nobody

What am I missing? Thanks!