Oracle listener cannot open new connections

Solution Unverified - Updated -

Issue

  • Oracle TNS listener is getting the following error messages:
TNS-12518: TNS:listener could not hand off client connection
TNS-12536: TNS:operation would block
TNS-12560: TNS:protocol adapter error
TNS-00506: Operation would block
Linux Error: 11: Resource temporarily unavailable

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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