Firewall Issues - Need Help Please

Hi
I'm new to Apple and love the machine, but I am having a problem with the firewall on my router. Let me explain the setup, then the problem...
I have the following in my home network:
1 hp desktop running Windows XP Media Center Edition, SP3 (Professional)
1 Belkin wired / wireless router
1 Canon Pixma MP500 Printer set for Sharing (Connected to hp desktop through USB)
1 iMac 20" running Leopard OS
The hp desktop and the iMac are both hardwired to the router. The router's security settings are as follows:
Will NOT broadcast the SSID
Mac Filtering is ENABLED
WPA-PSK Security ENABLED
Wireless connectivity is ENABLED (For Wii, PSP, and Xbox 360)
Now the problem...
Everything on the network works beautifully, except the iMac. It will not allow iChat services, will not allow sharing of the desktop with other iChat members. It does, however, connect to the internet, but will not access the hp shared folders or printer. When I attempt to even add the printer, the printer does not even show up. I DO have Bonjour installed on the hp, but when I run Bonjour, I get a message that reads something like, "There are no Bonjour enabled printers available."
I know it is the firewall built into the Belkin router because I placed the iMac into the Demilitarized Zone, and everything started working as expected. For those of you not familiar with DMZ on the router, it basically allows you to pick an IP address to place outside of the firewall, so you can keep the router firewall enabled, but you can choose an IP address (i.e., a computer) that is not behind the firewall.
After placing the iMac in the DMZ, I went to add the shared printer on iMac. Not only did it show up immediately and give me the ability to add it and print to it, but I could also browse shared folders on my hp. I was also able to connect to a friend on iChat, and we were able to share each other's desktops.
I can provide more information if needed, but any help on this matter would be greatly appreciated.
Thanks a lot.
Message was edited by: Wheelermdw
Message was edited by: Wheelermdw

I forgot to add that before I placed the iMac in the DMZ, I opened up some ports on the router that allowed iChat communication, so a comprehensive list of ports that need to be opened might solve these problems. I do not know where to find such a list, but I think that might work. If someone could provide a list, that would be great. I will update this post and let you know if the list was successful.

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Belkin Router Firewall Settings - Need Help Please

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