I tried to install NC14 on my new Synology NAS. I got a fail error.
In the message is an IPv6 address. But that is the address of the client computer I use, not the actual IPv6 address of the server.
Since websites on virtual hosts work correctly, there must be something wrong in the installation procedure. It does not get the correct server IPv6 address! And IPv6 is preferred so a fall back to IPv4 can only be archieved by disabling all IPv6.
After disabling IPv6 on the network interface and rebooting I get my internal client computer IPv4 address and not the server address. The server is on a subnet IPv4 and IPv6 with external access.