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ERROR_PORT_NOT_SET
What ERROR_PORT_NOT_SET means
The requested detach or cleanup action had nothing to remove. This is usually a sequencing or ownership issue in debugging infrastructure, not a network-port problem.
Where it appears
- debugger detach and process teardown
- diagnostic tools manipulating native debug state
- cleanup after a failed attach
Likely causes
- the attach never succeeded
- another debugger already detached
- cleanup executed twice
- the target process exited and lost the association
What to collect
- attach result and debugger PID
- target process lifetime and exit time
- all detach attempts with thread IDs
- whether another debugger or security product intervened
How to respond
Make debugger cleanup conditional on confirmed ownership of an active debug association. Preserve the original attach failure and treat this later status as secondary unless an unexpected third party removed the port.
References
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