[avahi] Ubuntu 18 on EC2, Avahi doesn't work

[Andrew Stuart]

I’ve spent all day on this without success.

I’ve boiled the test down to this:

** start two brand new clean EC2 instances running Ubuntu 18.04
** both instances are started in the same VPC and same subnet so they should be on the same local network
** sudo apt install avahi-daemon

ps ax on machine 1 shows:
 1847 ?        Ss     0:00 avahi-daemon: running [ip-10-0-0-72.local]

ps ax on machine 2 shows:
 1866 ?        Ss     0:00 avahi-daemon: running [ip-10-0-0-124.local]

A direct ping using ip addresses between the machines works.

Nothing I do makes allows me to see the other machine using hostname.local

I’ve read vast number of web pages and spent 12 hours fiddling with every possible setting I can find to make them talk to each other. 

Can anyone help?

thanks

Andrew