Concurrent clients to a single VPN server

I had setup an OpenVPN server in Windows Server 2003 successfully. The server 
has a public IP address and is listening on its default port.

My client (on WinXP) works flawlessly as well.

I then added a second TAP adapter on the Server in order to add a second VPN 
interface, as to allow another client to connect concurrently to the same LAN.

The LAN I'm accessing is 10.3.1.0/24, so I defined its first VPN interface as 
10.3.2.1/24 and the client as 10.3.2.2. No problem there.

The second interface is defined as 10.3.3.1/24 and another client as 10.3.3.2, 
but it seems not to be able to reach the LAN as 10.3.2.2 does!

I can ping from 10.3.2.2 to 10.3.2.1 and into the LAN (10.3.1.x), but I cannot 
ping from 10.3.3.2 to 10.3.3.1 and, obviously, not to the LAN from that second 
interface either...

What's wrong?

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  Fabio
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