Comment # 9 on bug 1212627 from Jonathan Kang

(In reply to Adam Majer from comment #8)
> 
> The IPv4 address is non-routable and configured via DHCP, and the only
> public address available is the IPv6. It's configured manually, so it's not
> like there is a long wait for RA or something,
> 
I'm guessing maybe the network link is not yet ready when sshd is started. This
needs detailed NetworkManager logs. To collect them, you need add the following
lines in /etc/NetworkManager/NetworkManager.conf.

> [logging]
> level=TRACE

> 
> 
> In the "old days", all network interfaces should be configured as much as
> possible before the rest of the system is signaled that network is ready.
> So, passive configuration via RA for IPv6 would be out-of-scope for this
> wait but everything else should be blocking. Static IP assignments should
> definitely be all assigned prior to signaling network setup is successful.
> 
> Basically, I would expect all configured network interfaces to be up and
> configured completely before proceeding. It's not OR condition here but AND.
> Optionally things could proceed after some timeout, like 2 or 3 minutes, if
> we are waiting for external resources that may be failing (eg. DHCP)
> 
> Finally, an answer here that "it would work if you just listen on wildcard
> address" is not really a good answer here.