Access Denied on COM port with ESP32 (Windows)

[wardelder]

I figured out an issue. When trying to program an ESP32 on my Windows machine, I would often get an Access Denied error. I followed this site to find out what was "locking" the COM port the ESP32 was on: https://knowledge.ni.com/KnowledgeArtic ... AG&l=en-CA

Turns out I own a golf computer called a SkyCaddy golf computer... it has an app called CaddieSync. This stupid app sits in the background and locks all COM ports looking for a SkyCaddy. What a stupid app... After killing Caddie Sync, all my troubles have gone away! (at least most of them...)

Hope the link I sent helps others discover what poorly written software is running in the background of their computers, tying up their COM ports.