PPTP clients in local (inside nat) net can't connect to PPTP server.
I can solve this problem only for ONE client by adding rule to destination nat like this:
sh nat destination rule 1
inbound-interface eth0
protocol gre
translation {address a.b.c.d}
But this is not solution, because client address is not fixed and there can be many clients.
I tried enable/disable conntrack modules pptp and gre, but unsuccesfully.
On versions 1.1.7 and 1.1.8 all work fine. Problem there is on version 1.2.0.