> listen 80;
> listen [::]:80 ipv6only=on;

Remember that ipv6only is a socket option, and you can specify a socket option
only once per address:port pair:
> A listen directive can have several additional parameters specific to
> socket-related system calls. They can be specified in any listen
> directive, but only once for the given address:port pair.


So your config needs to look this way, if you have multiple server statements in your config:
> server {
> listen 80;
> listen [::]:80 ipv6only=on;
> [...]
> }
> server {
> listen 80;
> listen [::]:80;
> [...]
> }
> server {
> listen 80;
> listen [::]:80;
> [...]
> }


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