Comment # 19 on bug 1204070 from Zombie Ryushu

I have disabled Owl. Okay, so I have tried on several systems and the result is
always the same: Thunderbird 102 does nothing, but if I back up the version to
91.13, and install TbSync it all works again as intended. If I install the beta
version of TbSync for 102 by sideloading it from Github, then all TbSync seems
to do is map a CardDav/CalDav entry to Thunderbird using it's native provider.

This maybe out of left field, but this server has two IP addresses, (its behind
a NAT) and can be accessed internally via VPN or a local Wifi AP or network
Jack as "olympia.pukey" as its internal address. How does Thunderbird use DNS
For this kind of Auto-discovery of address books?