Why SSH connections hang/drop with "Network error: Software caused connection abort" putty error message?

Solution Verified - Updated -

Issue

  • ssh connection breaks after sometime
  • ssh hangs with "Network error: Software caused connection abort" error
  • putty disconnects with "Network error: Software caused connection abort" error

Environment

  • Red Hat Enterprise Linux (All Versions)
  • openssh server
  • Putty ssh client

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