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Intermittent EADDRINUSE on Syslog TCP Source

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Jeremy Prescott
Jeremy Prescott Posts: 33 ✭✭
in Stream

Occasionally when looking at the Status of my Syslog Source, which has a configured TCP Port of 51111 : Error: Initialization error: bind EADDRINUSE 0.0.0.0:51111

I don't have any other Sources or Destinations on the machine configured to leverage that port.

I don't see there error on application startup either.

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Answers

  • Kyle McCririe
    Kyle McCririe Posts: 29 ✭✭
    edited May 2023
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    What your facing is likely Ephemeral Ports, which are short lived ports leveraged by the Operating System. Your configured TCP Port is pretty high, and likely falls within the range of the Ephemeral Ports. You can read about ephemeral ports here:  The Ephemeral Port range for your system can usually be found by checking proc/sys/net/ipv4/ip_local_port_range
    Example:

    # cat /proc/sys/net/ipv4/ip_local_port_range
32768   60999

    So what's likely happening here is the Operating System just so happens to leverage an ephemeral port that is the same port as your configured TCP source.
    This is an OS related function, outside of Stream's control.
    Your TCP Syslog Port just so happens to fall within the default range.

    https://en.wikipedia.org/wiki/Ephemeral_port

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