Authentification forwarding with ssh on f15

[Remi Collet]

I have a strange issue with Authentification forwarding.
It works for me for years...
(and I've just test it on my old fedora 14)

And stop working in fedora 15 (beta, full updates)

Using the same account name on all hosts:

$ ssh serveur1 hostname
ok

$ ssh serveur2 hostname
ok

$ ssh -A serveur1 ssh serveur2 hostname
Permission denied, please try again.
Permission denied, please try again.
Permission denied (publickey,gssapi-with-mic,password).


Any idea where to search ?

Remi


P.S. serveur1 runs RHEL5.6, serveur2, various OS (debian, CentOS, ...)