PPTP vpn connexion problem

[galphanet]

Hello,

I'm using pfSense 2.0 BETA 5 (64 bits) with PPTP vpn on a remote subnet.
I run pfsense on a Qemu/KVM virutal environment, which is perfectly working for now !

The only problem I have is with PPTP vpn. I can open the connexion but I cannot ping the remote endpoint.
I added rules to allow PPTP traffic, etc.. but here is the ping output :

Exactly the same configuration on an ALIX board is perfectly working…
So now I forward PPTP connexions to the ALIX board (running also pfSense 2.0 BETA 5 32 bits)

PING 10.20.30.1 (10.20.30.1): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
Request timeout for icmp_seq 6
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
Request timeout for icmp_seq 9
Request timeout for icmp_seq 10
Request timeout for icmp_seq 11
Request timeout for icmp_seq 12
Request timeout for icmp_seq 13
Request timeout for icmp_seq 14
ping: sendto: No buffer space available
Request timeout for icmp_seq 15
ping: sendto: No buffer space available
Request timeout for icmp_seq 16
ping: sendto: No buffer space available
Request timeout for icmp_seq 17
ping: sendto: No buffer space available
Request timeout for icmp_seq 18
ping: sendto: No buffer space available
Request timeout for icmp_seq 19
ping: sendto: No buffer space available
Request timeout for icmp_seq 20
ping: sendto: No buffer space available
Request timeout for icmp_seq 21
ping: sendto: No buffer space available
Request timeout for icmp_seq 22
ping: sendto: No buffer space available
Request timeout for icmp_seq 23
ping: sendto: No buffer space available
Request timeout for icmp_seq 24
ping: sendto: No buffer space available
Request timeout for icmp_seq 25
ping: sendto: No buffer space available

Can you help me on this issue ?
What information do you need to help me ?

Thanks you !