Rsync/scp traffic stalling through pfsense

[kfarooq]

Hi,
  We are using pfsense(2.2.5-RELEASE) for our network traffic. We are facing issue with rsync/scp through our WAN interface as LAN traffic is NAT into WAN traffic and then WAN is also NAT again towards the destination. SSH & other kind of traffic works fine for the destination.
  What we can do to fix this issue.

Regards,
Farooq