Problem with access between 2 bridged lans

[AlfA]

I have PFsense 1.2.3-release embedded on an alix with 3 NIC and 1 wireless card.

1 nic is WAN, onter is LAN, 3th is not used at the moment.
WAN is via DHCP connected to cable modem.
WLAN interface is bridges with LAN.

Now, the is a problem when using the WLAN interface to connect to LAN computers.
from WLAN to LAN, I can ping, use network shares, etc.
But when I want to connect from WLAN to an MySQL database thats on my LAN, I can't get any connection directly to MySQL, but I can use the web interface on that same IP.
There are some more services that do not work, others work, very strange to me.