Wlan problem on SBS server 2003

I want to place my SBS 2003 Server behind a NAT-Router with buildin wLAN
Access point (and VIOP).

Router:
WAN is DHCP - LAN is 192.168.1.1 (IP-range 192.168.1.10 - 50)
I use Dyndns to get to address the Router
DMZ is 192.168.1.90

SBS 2003 Server:
WAN is Static 192.168.1.90 - DSN is 192.168.1.1
LAN is 192.168.16.2 (IP-Range is 192.168.16.10-254) - DSN is 192.168.16.2.

Everything works fine. I can get to the web-server on the SBS server from
LAN, wlan and from outside.
I can use Connection Manager to connect to SBS from outside but not from
wLAN - I can't see why.

Can anybody help pse?

Regards
Erik