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This is an old revision of the document!

Issues

debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

SSH hangs on debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

Not catched root issue yet. Internet says it is related to packet size. So some workaround sometimes works:

  1. reducing MTU in interface
  2. limiting Kex list (reduce packet size during exchange)
ssh -o KexAlgorithms=ecdh-sha2-nistp521 username@systemname 
 
~/.ssh/config
KexAlgorithms ecdh-sha2-nistp521

X11 forwarding request failed on channel 0

/etc/ssh/sshd_config
X11Forwarding yes
X11UseLocalhost no