Mount nfs and rpcbind

I was trying to mount a NFS4 share:

mount -t nfs 10.0.2.15:/drbd/main/shared/ /opt/oracle/domains/osbpl1do/shared
mount.nfs: Connection timed out

Of course, I forgot to start the nfs service:

/etc/init.d/nfs start

Starting NFS services:                                     [  OK  ]
Starting NFS quotas: Cannot register service: RPC: Unable to receive; errno = Connection refused
rpc.rquotad: unable to register (RQUOTAPROG, RQUOTAVERS, udp).
                                                           [FAILED]
Starting NFS mountd:                                       [FAILED]
Starting NFS daemon: rpc.nfsd: writing fd to kernel failed: errno 111 (Connection refused)
rpc.nfsd: unable to set any sockets for nfsd
                                                           [FAILED]

Mmmmm, what is going on here..... I try to get some info on the rpc service:
rpcinfo -p

rpcinfo: can't contact portmapper: RPC: Remote system error - No such file or directory

hell on Earth... let me restart the rpcbind service:

service rpcbind restart

Stopping rpcbind:                                          [FAILED]
Starting rpcbind:                                          [  OK  ]

rpcinfo -p

   program vers proto   port  service
    100000    4   tcp    111  portmapper
    100000    3   tcp    111  portmapper
    100000    2   tcp    111  portmapper
    100000    4   udp    111  portmapper
    100000    3   udp    111  portmapper
    100000    2   udp    111  portmapper

at last I can start the nfs service: /etc/init.d/nfs start

Starting NFS services:                                     [  OK  ]
Starting NFS quotas:                                       [  OK  ]
Starting NFS mountd:                                       [  OK  ]
Starting NFS daemon:                                       [  OK  ]
Starting RPC idmapd:                                       [  OK  ]