Slow ssh connection, SSH2_MSG_KEXINIT takes over a minute

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Issue

We loose over 1 minute between:

Oct 21 13:22:17 Host1 sshd[12490]: debug1: SSH2_MSG_KEXINIT sent
Oct 21 13:23:19 Host1 sshd[12490]: debug1: SSH2_MSG_KEXINIT received

Environment

Red Hat Enterprise Linux 6

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