During my latest Apache configuration change I ran into an issue where I wasn’t able to restart/start. This was the first time I encountered this and I was fairly positive the issue wasn’t due to my configuration changes. I also knew that a port can only be used by one application or daemon at a time so that clued me in that something else was already using the port. While I can’t give a definitive cause for the situation, I can give pointers on resolving the issue. Note that this pertains to Apache running on Linux so your mileage may vary.

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