How to restrict number of sftp sessions on a per user basis

Solution Unverified - Updated -

Issue

  • A valid user opens more and more sftp sessions, in the end the network stack overflow will kill all access to the machine, and other connections will not be accepted anymore.
  • MaxSessions setting in sshd_config does not restrict number of individual sessions.
  • maxlogins in /etc/security/limits.conf limits individual ssh sessions on user basis, but not number of sftp sessions on per user basis.

Environment

  • Red Hat Enterprise Linux 7.x

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