Use ASDM to manage IPS SSM-10 on ASA5510

Hi experts, I'm very new to ASA5510 configuration (I use ASDM GUI mainly) Here's my problem as clearly as I can explain it::

I can access ASDM for the firewall management via VPN, but I cannot access the IPS tab to manage the SSM-10 module. I always get a message stating :"Error connecting to sensor. Error Loading Sensor".

If I SSH to the ASA, I can do "asa# session 1" to access the SSM, so I know it's there and up.

What I am trying to achieve ultimately is this : administrate the whole ASA via a VPN connection coming from the WAN.

The only way I managed to get access to the IPS tab was by having the ASA's management port, the SSM's management port and my PC all connected on the same switch. This won't work in my production environment since it's off-site.

So what I need to know is:
1- How should the network cables be physically connected once in production? Is there a way to manage the IPS with ASDM using the internal backplane or do I absolutely need to have the IPS's management port connected to some other ASA's port via a router. If so, which port (management or another)? My VPN connection will come from the WAN.

2- What IP address should the IPS use if my VPN address pool is 172.16.1.100-199 ?

3- What should be my Management Access Interface? Right now it's the "management" port.

4- Any specific firewall rules need to access the IPS?

Hope you can help me. If you need more details, just let me know.

dstj.
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Here is my ASA port configuration :

interface Ethernet0/0
 speed 100
 duplex full
 nameif outside
 security-level 0
 ip address dhcp setroute
!
interface Ethernet0/1
 nameif dmz
 security-level 50
 ip address 192.168.10.1 255.255.255.0
!
interface Ethernet0/2
 nameif inside
 security-level 100
 ip address 192.168.20.1 255.255.255.0
!
interface Ethernet0/3
 nameif corpo
 security-level 75
 ip address 192.168.30.1 255.255.255.0
!
interface Management0/0
 nameif management
 security-level 100
 ip address 192.168.1.1 255.255.255.0
 management-only
!

Here is the IPS current configuration (got via SSH):

service host
network-settings
host-ip 192.168.1.2/24,192.168.1.1
host-name sensor
telnet-option disabled
access-list 172.16.1.0/24
access-list 192.168.1.0/24
exit
time-zone-settings
offset 0
standard-time-zone-name UTC
exit
exit
...
service web-server
port 443
exit