Multiple gateways and what seems to be Asymmetric Traffic

[Nicholas Elphick]

Ok I have an interesting one if anyone has come across this issue and has found a fix I would be eternally grateful.

I have a SG-5100 netgate device.
I have 3 WAN connections, 1 direct to the internet, 1 to a SIP gateway, 1 connection to a private MPLS network and 2 LAN networks.
I have set the MPLS network to have full access nothing blocked to the local LAN networks.
However the traffic to the MPLS network is showing masses of blocked traffic TCP:A, TCP:RA etc being blocked by rule 1000000103 and this is causing many services to fail.

All the routes into the MPLS network are static and the only default route is set to use the WAN. (SIP Routes are also static).

Does anyone have any ideas on how to correct the issue?

Cheers