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From: Michiel Boland <michiel@boland.org>
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Cc: current@freebsd.org
Subject: Re: NFS mounts dissapearing
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Sean Bruno wrote:
> I've noted that my NFS mount of a directory is vanishing periodically
> under -current.  I am unable to unmount/remount the directory and the
> system returns Permission Denied on all attempts to access the
> directory.
> 
> Is this something that is known and being investigated?

FWIW I am seeing this too, except that I can still umount/remount. It appears to 
me that TCP connections to remote nfsd use a privileged source port initially, 
but if the connection is severed and reestablished later the source port is no 
longer < 1024. Client is -CURRENT, server is solaris with nfssrv:nfs_portmon=1.

Cheers
Michiel