At first glance a few things stand out. Obviously you have a connection error (Connection refused). Assuming you are sure your internet connection is stable, did you verify in your terminal that you can reach ocsp.apple.com on port 80? I just tried it on my machine and it works.
% curl --verbose http://ocsp.apple.com/ocsp03-applerootcag3
* Host ocsp.apple.com:80 was resolved.
* IPv6: 2620:149:a0d:f100::2, 2620:149:a0d:f000::1
* IPv4: 17.253.120.201, 17.253.120.202
* Trying [2620:149:a0d:f100::2]:80...
* Connected to ocsp.apple.com (2620:149:a0d:f100::2) port 80
> GET /ocsp03-applerootcag3 HTTP/1.1
> Host: ocsp.apple.com
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 200 OK
< Server: Apple
< Date: Sun, 29 Sep 2024 22:52:28 GMT
< Content-Type: application/ocsp-response
< Content-Length: 5
< Age: 0
...
If it is an intermittent problem, you should add retry with exponential backoff or otherwise queue it for later.
voxelholic
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution