Ipsec opt1 wan up but no traffic

[a.tatulli]

Hello everybody

I have 3 wan and 1 lan.

I have an ipsec tunnel, no problem if i use default wan.
If i choose OPT1(2nd wan) interface, and change settings, tunnel could connect too but no traffic can pass throughout.

Is there any additional rules  that i missed?
There's some problems with ipsec using optional wan interface?

Help plz!

[a.tatulli]

anyone could help??