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Windows Failover Cluster across sites

Dear Team,

I'm attempting to configure my first failover cluster in windows server 2016 for sql purposes across sites (different subnets). When the failover cluster goes through the validation in SITE A (DR-SQL1) the validation fails with the following errors:

 * Node DR-SQL2 is not reachable from node DR-SQL1. It is necessary that each cluster node can
    communicate each other cluster node by a minimum of one network path (though multiple paths
    are recommended to avoid a single point of failure). Please verify that existing networks
    are configured properly or add additional networks.
 * Node DR-SQL1 is not reachable from node DR-SQL2. It is necessary that each cluster node can
    communicate each other cluster node by a minimum of one network path (though multiple paths
    are recommended to avoid a single point of failure). Please verify that existing networks
    are configured properly or add additional networks.

Although when I run the same validation test from SITE B (DR-SQL2), they all pass just fine.

Any ideas where I should start looking, the firewall rules should allow all traffic to pass through between these 2 hosts.

Thank you.
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Cliff Galiher
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The issue was a NAT Rule on the firewall. Thank you!