[RHEL 7] Network daemons on server are not able to receive any data

Solution In Progress - Updated -

Issue

  • Network daemons (sshd for example) are not able to receive any data.
  • User is not able to ssh into the server with following symptoms:
    • No error message is returned.
    • ssh session just hangs.
    • Strace of the session is empty.
  • sshd process(es) on the affected server is consuming all CPU resources

  • This behaviour do not affect only ssh but also sendmail for example.

Environment

  • Red Hat Enterprise Linux (RHEL) 7

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