Cant browse internet

i have 2 configured 2 different subnets on 2 interfaces ,, subnet A is able to browse the internet but subent B is not able to browse but subnet B is able to ping 8.8.8.8 on the internet

In policies everything is allowed and in Nat i am doing source NAT with Interface PAT (untrust interface)  by 2 sources subnet A and Subnet B.

any hints why subnet B is not able to browse internet.

Thanks