Having done a bit of research, it may not be just the Firewall. Privacy-->Local Network seems to not be behaving itself. https://mjtsai.com/blog/2024/10/02/local-network-privacy-on-sequoia/ Adrian.

Anyway, cutting a long story short I changed my post on the Apple Support Forums here: https://discussions.apple.com/thread/255787787?answerId=260836704022&sortBy=rank&page=3#260836704022 I upgraded to Beta 15.1 24B5070a and the Firewall issue still exists. Where can I feedback so a fix gets implemented in 15.1? I have already used the builtin feedback tool. Thanks very much. Adrian.

Thanks DTS Engineer, I came here to comment on the Firewall because I mentioned Beta 15.1 24B5070a on the Apple Support Forums and they sent me this after deleting my post: "Hi losdelrock, Thanks for participating in the Apple Support Community. We removed your post “Mac OS Sequoia 15.0.1 - TimeMachine because it contained information about beta software. To comment or ask questions about beta software, go to our Apple Developer Forums page: https://developer.apple.com/forums/ Here you can share your Mac OS Sequoia 15.0.1 - TimeMachine post, make comments, and ask questions. For more information, see the Apple Beta Software Program page: https://beta.apple.com/sp/betaprogram We’ve included a copy of your original post below." Please let me know where we post Firewall issues on Beta versions of MacOS? Thank you. Adrian.