systemd: <SomeService>.socket: Too many incoming connections (64)

Solution Verified - Updated -

Issue

  • Unable to get rexec to accept any more than 64 connections on RHEL 7

  • I disabled sshd.service and am instead using the sshd.socket unit and I noticed that I can't have more than 64 concurrent connections

  • Why can't I open more than 64 telnet connections to a Red Hat Enterprise Linux 7 server?

Environment

  • Red Hat Enterprise Linux 7
  • systemd

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