VPN Pfsense <-> juniper : UP in one side, not in the other

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Hello,

I have a problem for a VPN ipsec between a Pfsense 1.2.3 and a Jumiper SSG 320.

In the side Pfsense -> Juniper, the vpn goes up no problem, the communication is OK.
In the side Juniper -> Pfsense, the VPN stay off.

We test differents types of parameter for the configuration of the VPN, and we have the same problem.

the only view I have when the juniper initiate the VPN in the log is :
ERROR: no iph2 found: ESP  <gateway dist="">-> <my gateway="">spi=265506213(0xfd34da5)</my></gateway>

I find nothing about this error.

If someone have a Idea, will be the welcoming

Thanks