I'm running M3 on Centos 1.7
Ran in to the following error when trying to start the NFS Gateway...
'Cannot register service: RPC: Authentication error; why = Client credential too weak'
One trick is to start with the '-i' or insecure setting, but I'd rather fix the problem outright.
I'm running 5.1 on a single node cluster (intel i7 NUC)