nfs permission denied

[mauricev]

When I use debian-sources, I can mount the exported nfs share (nfs v3) on this system, but when I try to use a gentoo-sources I customized, I get this instead:

mount.nfs: access denied by server while mounting zfs:/z/nfs

In debugging, I get 

mount.nfs: mount(2): Permission denied

So something has to be missing from my gentoo-sources, but I don't know what it can be. Everything seems to be in order according to exportfs and rpcinfo.

More info, the log reveals

[rpc.mountd] authenticated mount request from 127.0.0.1:836 for /z/nfs (/z/nfs)
Aug 02 23:41:23 [rpc.mountd] Cannot export /z/nfs, possibly unsupported filesystem or fsid= required

 

[mauricev]

How odd, I set fsid=0 as an option to the export line and now it works in the older gentoo kernel.