Problem configuring two NICs on different subnets

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Issue

I have a server with 2 Network Interfaces and I configured both the NICs on 2 different subnets. Workstations with just one NIC can communicate with the server on the shared network, but not on the other network.
When I bring assign a IP to new network interface the system stops communicating ?

Environment

Red Hat Enterprise Linux 6
2 Network interfaces, each on a different network

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