connection refused vs time out on FreeBSD #483
Description
I run CI jobs on several different CI systems and Cirrus CI for the curl project and I'm right now working on a potential little change in how we handle timeouts during TCP connection.
A few of the tests we run attempts to do a TCP connect to 127.0.0.1 to a port number that isn't used - I've tried with 60000 and 2 and we want it to end with a connection refused which means that not service is listening on that port. Presumably, unless I do something, there is nothing listening on those ports.
The tool does a TCP connect. I want to verify that it handles a connection refused correctly.
But here's the thing: instead of connection refused, my connect attempts time out after 75 seconds on the Cirrus CI FreeeBSD machines.
I can't find any documentation explaining this nor how it can be changed. Can it be changed at all? Is there any TCP port that will result in connection refused? I'd love a little hint or pointer!