ERR_SOCKET_UNBIND

Socket error during Unbind operation

Allen-Bradley · MicroLogix 1400 Programmable Controllers

What does ERR_SOCKET_UNBIND mean?

An error occurred during the socket unbind operation. This indicates a failure to release the local IP address and port associated with a socket, potentially leaving resources held or in an unstable state.

Common Causes

  • System resource conflict preventing the release of the bound socket.
  • Internal operating system error during the unbind process.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Restart the controller to force a clean release of network resources.

  2. 2

    Verify that no other processes are interfering with the Modbus TCP socket's binding.

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley MicroLogix 1400 Programmable Controllers