I found the failure. Since i replaced the mlnet file ist mldonkey 2.8.7 runing. This version replaces the 255.255.255.255 with 0.0.0.0/0 so it´s "not a bug it´s a feature"

And in my special case (using a ipcop firewall with a DMZ where the SME Server is located in) you have to include the Lan (called green in the Ipcop world) where my client is located when i want to access the mldonkey http sites (
http://server:4080) So i have to include it under security - local networks...
(if you are using Wlan/blue network you have to include this too) In the screen you have to put the DMZ/orange IP as "Router"...
Maybe there are other cop users with the same porblem...