You want to drop the wc -l.

Mac `grep -c` counts lines that match, so it always prints 1 line, so piping to wc -l will always return 1.

Or just open up and do netstat -an |grep TCP_WAIT and just watch it. If any don't disappear after a few minutes, then you're seeing the issue.

They probably aren’t affected because the buggy code was only added in macOS 26:

https://github.com/apple-oss-distributions/xnu/blame/f6217f8...