Windows 2003 NLB, not accessible from other subnet.

Hi All,
Ive setup 2 web servers (each with 2 NICs) into one Windows NLB cluster.
Im able to access this cluster very well from same subnet front-end IP are, but not from other subnet.
Details-
ServerA-
Front-end-
IP 192.168.40.217
Subnet mask: 255.255.255.0
Gateway: 192.168.40.1

Backend
IP 192.168.13.49
Subnetmask 255.255.255.0
Gateway: Null

ServerB-
Front-end-
IP 192.168.40.218
Subnet mask: 255.255.255.0
Gateway: 192.168.40.1

Backend
IP 192.168.13.50
Subnet mask 255.255.255.0
Gateway: Null

NLB IP  192.168.40.219
Subnet mask 255.255.255.0

I need to load balance only Front-end NIC and back-end is only for SQL access.

Im able to access this NLB IP within 192.168.40.x subnet without any issues, and also able to see the NLB Manager showing all servers Converged. All settings default.
Cluster Operation Mode  Multicast
Defined Port rules: 0-65535
      Both,
      Multiple Host
      Affinity : Single


Please help me in this, not sure what am I missing.