(Raised so I've an issue to fix.)

Describe the bug

Discussed in https://github.com/orgs/jamulussoftware/discussions/2811

See thread at https://github.com/orgs/jamulussoftware/discussions/2811#discussioncomment-3499166 onwards.

• The image on the left is mtr -f 2 93.42.88.44 - that is, it's a progressive ICMP ping trace route.
• The image on the right is mtr -f 2 -u -L 55859 -P 22124 93.42.88.44 - that is, much closer to the Jamulus protocol.

The IP and target port chosen here are visible and work on Jamulus Explorer

and the source port is open at my end. It's not just that host - if I run with showallservers, there's a lot of servers I see with empty ping:
.

To Reproduce

See above.

Expected behavior

Jamulus Client should be able to see all servers where the server has been configured following the server setup guide.

Screenshots

See above.

Operating system

Various.

Version of Jamulus

Various.

Additional context

See the thread.