Upgrade to MacOS 15.01 Alt port websites no longer load

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1

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Description of the issue:
How can this issue be reproduced?

  1. Mac M1 Hardware
  2. Update to MacOS 15.0.1
  3. Try to load a website run on an alt port such has http://hostname:
  4. TCPDUMP on both end point web host and MacOS does not show a TCP:SYN request

Expected result:
Expected result is that that web page will load showing content (as it did before the upgrade to MacOS 15.0.1) instead of a failed to load.

Brave Version( check About Brave):
Brave is up to date

Version 1.71.118 Chromium: 130.0.6723.70 (Official Build) (arm64)

Additional Information:
Don’t know what else to provide. TCPDUMP clearly shows that no TCP:SYN request on the alt port, but TCPDUMP does show TCP:SYN if using a normal web related port such as :80, :443

2

Not certain how helpful, but maybe - Terminal window, enter:

netstat -an | egrep -i '.*(ESTABLISHED|CLOSE.*|TIME.*|LISTEN).*'

Another perspective; at:

https://stackoverflow.com/questions/38867905/how-to-view-dns-cache-in-osx

Scroll down to:

mDNSResponder (multicast DNS daemon) SIGINFO signal can dump a snapshot summary of the internal state to /var/log/system.log , including the cache details. To do this:

3

thanks for the response. I believe this is an Apple MacOS issue. Since Safari works (trusted app) and all other browsers I tried (Chrome, Edge, Brave, MulvadBrowser, Opera) do not work for high ports. So this appears to be an internal (to MacOS) app/Firewall issue and Apple has not documented where this setting is.

4

If it is a macOS issue, I just thought I’d point out, in case you missed it, there was a new OS release yesterday for 15.1 (from 15.0.1)… maybe see if that update helps? :man_shrugging:

5

Thanks, already started the install when your response came across. Test box is being updated.

6

And still broke. I’ll be posting on Apple’s community site to see if I can get info there.

Thank you to all those that replied.

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