Hi @twns5
I have an old version in my lab, so I cannot really confirm, but can you try:
Switch(config)# ssh port ?
<15001-65535> Specify port number
This is from a Nexus 9K, but since is NXOS running on both N9K and MDS, it could be possible that changing the port was added for MDS as well.
Hope it helps,
Sergiu