[FIPS] ssh to RHEL6 server fails with message "ssh_dispatch_run_fatal: Connection to XXX port 22: invalid argument"

Solution Verified - Updated -

Issue

  • On a RHEL8 system with FIPS enabled, connecting to a RHEL6 system fails, ssh -v displays the following message

    [...]
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(2048<8192<8192) sent
debug1: got SSH2_MSG_KEX_DH_GEX_GROUP
ssh_dispatch_run_fatal: Connection to XXX port 22: invalid argument

Environment

  • Red Hat Enterprise Linux 8

    • openssh-clients (ssh)
    • FIPS

  • Red Hat Enterprise Linux 6

    • openssh (sshd)

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