[tor-relays] Unable to bind to IPv6

[Eddie via tor-relays <tor-relays@xxxxxxxxxxxxxxxxxxxx>]

I had an issue with my VPS that I didn't notice for a while where I had 
lost my IPv6 addressing.  After contacting support they have restored 
the IPv6 address, but I'm now unable to bind to the address.  I've a 
feeling it's more either my configuration or the VPS configuration at 
fault, not tor, but I thought I'd throw it out for ideas, as I'm not 
that confident (yet) with IPv6 stuff.

Here's the interface:

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state 
UP group default qlen 1000
    link/ether a6:6a:08:73:42:27 brd ff:ff:ff:ff:ff:ff
    altname enp0s18
    inet xxx.yyy.87.222/26 brd xxx.yyy.87.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 aaaa:bbbb:1a:10::1/64 scope global dadfailed tentative
       valid_lft forever preferred_lft forever
    inet6 fe80::a46a:8ff:fe73:4227/64 scope link
       valid_lft forever preferred_lft forever

root@fw1475:~# ip -6 route
aaaa:bbbb:1a:10::/64 dev eth0 proto kernel metric 256 pref medium
fe80::/64 dev eth0 proto kernel metric 256 pref medium
default via aaaa:bbbb:1a:10:a46a:8ff:fe73:4227 dev eth0 proto static 
metric 1024 pref medium

And the netplan configuration:

root@fw1475:~# netplan status
     Online state: online
    DNS Addresses: 127.0.0.53 (stub)
       DNS Search: .

●  1: lo ethernet UNKNOWN/UP (unmanaged)
      MAC Address: 00:00:00:00:00:00
        Addresses: 127.0.0.1/8
                   ::1/128

●  2: eth0 ethernet UP (networkd: eth0)
      MAC Address: a6:6a:08:73:42:27 (Red Hat, Inc.)
        Addresses: xxx.yyy.87.222/26
                   aaaa:bbbb:1a:10::1/64
                   fe80::a46a:8ff:fe73:4227/64 (link)
    DNS Addresses: 1.1.1.1
                   1.0.0.1
           Routes: default via xxx.yyy.87.193 (static)
                   xxx.yyy.87.192/26 from xxx.yyy.87.222 (link)
                   aaaa:bbbb:1a:10::/64 metric 256
                   fe80::/64 metric 256
                   default via aaaa:bbbb:1a:10:a46a:8ff:fe73:4227 
metric 1024 (static)

And this is what I get from the IPv6 OR port, determined by 
commenting/uncommenting the relevant line in my previously working 
configuration:

2024-12-14T20:36:38.782783+00:00 fw1475 tor[2317]: Dec 14 20:36:38.782 
[warn] Failed to parse/validate config: Failed to bind one of the 
listener ports.
2024-12-14T20:36:38.782821+00:00 fw1475 tor[2317]: Dec 14 20:36:38.782 
[err] Reading config failed--see warnings above.

Any ideas/help would be gratefully accepted.

Cheers,
Eddie

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