Remote NAS Cluster Not Available? (Replication)

Hi all,

First time post here, but I'll do my best! I've been setting up replication between my primary site and DR site. I've got all networks (iSCSI, Client, and Management) going through two layer 3 switches. Those switches carry all VLAN's on a trunk and connectivity works as of now.

When I "Test Partnership" on my primary to my DR it works almost immediately, but when I "Test Partnership" on my DR to my primary it hangs. It never fails or passes at all, I've even gone into an SSH session and checked it there and it essentially looks like it's eternally "in-progress".

So far I've SSH'd into each interface and pinged across the network, all pings successful so I'm not sure it's a connectivity issue...

Any ideas?