@Carlos:

Keep in mind that NFS3 and NFS4 are very different. My workaround with
the port option is only intended for NFS4. NFS4 uses a single TCP
connection for communication between client and server. Portmapper (with
rpcbind) is not needed for NFS4. "My" internal error (for NFS4) is
caused by the fact that no UDP communication is possible between my
client and my server due to a firewall. Normally, NFS4 should first try
to use only the TCP connection _without_ using rpcbind(Portmapper), but
this simply not the case. Concerning "my" internal error, this is a bug.
The decribed behaviour only works if the port option is specified,
although the man page describes exactly the opposite.

Do you get any error messages in dmesg concerning the portmapper/rpcbind during 
the mount request (for NFS4 mounts)?
When I get those internal error messages, they always come along with error 
messages from rpcbind.

Maybe there are at least two different bugs which lead to this internal
error.

I think that people should clearly state if the intend to use NFS3 or
NFS4.

BR
Christian

-- 
8.04 & 8.10 nfs clients report "internal error" when attempting to mount NFS 
exports
https://bugs.launchpad.net/bugs/213444
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