The mountd service receives requests from clients to mount to the NFS server. When working with interface groups (with allow-manage-gids=on), it is possible to set it explicitly, rather than have it randomly selected on each server startup. This allows an easier setup of the firewalls to allow that port.
Use the following command to set and view the mountd configuration: weka nfs global-config set --mountd-port <mountd-port> and weka nfs global-config show.