Can not connect to server when no user open a gnome-session

Solution Verified - Updated -

Issue

  • Network connection failed after rebooting, can't ping or ssh to this server from other server. Waiting for 30 minutes, the problem was not resolved automatically.
  • Log in this system from Gnome environment.
  • After about 30 seconds, network connection succeed.
  • Log out the Gnome, network connection failed again.

Environment

  • Red Hat Enterprise Linux 7

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