How do I find and stop the process that is running a server on port 443

Question

I get this when I try to start nginx on ubuntu.

[emerg]: bind() to 0.0.0.0:443 failed (98: Address already in use)

How do I find and destroy process responsible?

Answer 1

As root:

lsof -i :443

...should reveal the offending process ID, assuming you have lsof on your operating system.