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Hi Stephen, I think the MTU size (at 9000) was the root cause! After changing it on both boxes back to 1500 and a reboot everything worked. I successfully tried via NFS, SMB and Rsync.
Wow, this is really absolutely unexpected.
Great! If you want to probe further, you could re-enable the jumbo frames, and then probe the path MTU between the NAS with ping (using the option to block packet fragmentation). My guess is that there's a switch on the path that doesn't support ethernet frames this large (though it might still support jumbo frames with a somewhat smaller MTU).
Or leave well enough alone. Jumbo frames don't always help performance - the main benefit is that they reduce the packets-per-second processing in the ethernet clients, which can reduce their CPU load. It doesn't matter much to the network itself - the overhead savings are inconsequential.
