Screen Sharing won't work, but every other VNC client will

I have been trying to resolve this for months, and nothing has worked so far. I can connect to my Mac Mini Server (Snow Leopard Server) from LogMeIn, from Chicken of the VNC, from JollyFastVNC, and from VNC clients on my iPad and iPhone. However, I cannot connect using OSX's own Screen Sharing service. I'm really frustrated, and I've posted here before without any sort of help. Is there ANYONE that can solve this problem for me?

To restate your issues and your question and your concern, you're frustrated, you're using a WiFi connection, you're not attempting remote access, it's not working for some protocols, and you're receiving unspecified error message(s).
Start by posting the diagnostics and messages received when this "doesn't work".
Then reconfigure the network, and (for testing) specifically move the screen sharing client box onto (and add one if needed) the same network switch as the server. Remove the WiFi device (a router) from the network connection. (Unmanaged gigabit network switches are cheap, too.)
In addition to and in parallel with reconfiguring the network (for testing), also confirm that all of the network port connections on the WiFi are established on the correct physical ports, if you're using that device as a network gateway and NAT device in addition to using it as a router.
Also ensure the firmware on the WiFi device is current.
Drop the firewall on the client.
Given you're probably on a NAT-based network and (guessing) using the WiFi device is configured as a gateway, post up some DNS or mDNS information, and a forward and reverse dig of the IP address. (I haven't seen issues such as this with local screen sharing via the Apple tools, but other Apple tools are known to be sensitive to incorrect DNS configurations.) From the same client you're attempting the screen-sharing:
dig -x your.target.ip.address.

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    Message was edited by: demadmonkey

    Firewall - Custom Filter Configuration
    Inbound IP Filter Rules
    Rule
    No. Status Access Protocol Source
    Interface Source
    Address Source
    Mask Source
    Port Op Destination
    Interface Destination
    Address Destination
    Mask Destination
    Port Op Log Enable
    Disable Delete
    122 P,E permit GRE any any any N/A any any any N/A No Protected Protected
    124 P,E permit 50 any any any N/A any any any N/A No Protected Protected
    2000 P,E deny TCP any any any any any 127. 0. 0. 1 host = 53 No Protected Protected
    2002 P,E,S permit UDP any any any any any 127. 0. 0. 1 host = 53 No Protected Protected
    2004 P,E deny UDP any any any any any 127. 0. 0. 1 host = 53 No Protected Protected
    2202 P,E,N permit UDP any any any any any 127. 0. 0. 1 host = 68 No Protected Protected
    2206 P,E,N permit TCP any any any any any 127. 0. 0. 1 host = 7547 No Protected Protected
    2228 P,E,N permit UDP any any any any any 192.168. 1. 64 host = 12526 No Protected Protected
    2230 P,E,N permit TCP any any any any any 192.168. 1. 64 host = 12526 No Protected Protected
    2238 P,E,N permit UDP any any any any any 192.168. 1. 64 host = 16402 No Protected Protected
    2240 P,E,N permit UDP any any any any any 192.168. 1. 64 host = 32141 No Protected Protected
    2242 P,E,N permit TCP any any any any any 192.168. 1. 64 host = 32141 No Protected Protected
    2244 P,E,N permit TCP any any any any any 192.168. 1. 64 host = 4 No Protected Protected
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