[lwip-users] Bind port problem

[Etienne Lanoy]

Hi everybody : 

On my product, I have an embedded configuration server based on TCP. User
can change this TCP port
to throught Firewall.
In my port_configuration variable, there is
the value of this famous port. By config, we can change it.
With this code I do that :

tcp_bind(global_pcb, IP_ADDR_ANY, port_configuration);
global_pcb = tcp_listen(global_pcb);
tcp_accept(global_pcb, config_server_ip_accept);    

The problem is when I execute this code to change the port binded, after
it, I can connect to my product with the
old and the new port. The old port isn't unbind.

I have seen in the global_pcb, that the old
and the new port are in it. But I don't want it.

How can change the port of my embedded server without have old and new port
connection capabilities ?

Ex :

BEFORE : 
 Config : TCP/9999
--------------------> PRODUCT 

AFTER (we want that the user acceed to the product by the port number 10000)
Config : TCP/9999
    AND
Config : TCP/10000
 --------------------> PRODUCT 

I thank you a lot.
Etienne