Thanks a lot. Sorry for asking something mentioned in a FAQ
I'll get me the FAQ now.
The answer as Hal Stern correctly was the first to point out:
make sure that root is not in more than 8 groups on your
solaris client -- the client credentials could contain too
big a group entry for the SOSS server.
--hal
Casper Dik says:
The solaris FAQ says:
5.10) I get ``Invalid client credential'' when mounting filesystem on
    Solaris client from non-Sun fileserver.
    Some vendors still ship a version of RPC/NFS that allows at
    most 8 groups in the client credentials.  Root on Solaris is by
    default in 10 groups.  As a result, the Solaris 2.x mount
    command will send AUTH_UNIX credentials that are too big to
    cope with for the remote mount daemon resulting in the ``Invalid
    client credential'' error.
    Workaround: put root and all your users in 8 or less groups.
    NOTE: You must logout and login again for changes in the number
    of groups to take effect. (or exit root's shell and re-su)
Thanks go to:
Hal Stern - NE Area Systems Engineer
Richard Hellier				rlh@cppuk.co.uk
Dave Fetrow				fetrow@biostat.washington.edu
Frode Stromsvag                email: frode@read-well.no
READ Well Services a.s.
Ravnsborgveien 56
P.O. Box 25
1364 Hvalstad                  Phone number: +47-66982240
NORWAY                         FAX number:   +47-66982022
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