[cvsnt] strange probleem

[Jonas Geiregat]

First I do
set cvsroot=:sspi:eniacBOX:/test
then I add a new user
cvs passwd -a -r "eniac" "testuser"
He asks me to give in a passwd so I do that
then I reset my cvsroot to :sspi:testuser at eniacBOX:/test
then I do cvs login
and I get:
Loggin in to :sspi:testuser at eniacBOX:2401:/test
CVS password: ********
cvs [login aborted]: unrecognized auth response from eniacBOX: cvs 
[server aborted]: Authentication failed
but I can login as user eniac ....
What could it be ?