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while Fedora 18/19/20 and RHEL7-Beta supporting ECDSA keys that is not the case for RHEL6.5 - the OpenSSH shipped with RHEL6 now has support, so it must be the openssh package ssh-keygen -t ecdsa -b 521 /etc/ssh/ssh_host_ecdsa_key Bits has bad value 521 (too small)
*** This bug has been marked as a duplicate of bug 1028335 ***
BZ 1028335 is not visible to the public, could it get opened?