So first of all to fix the issue you want to edit your container and add a port.

Add the port to the environment variable FIREWALL_VPN_INPUT_PORTSīy default, IPv6 is just blocked by the firewall in gluetun.I managed to finally solve the issue! I also found a link to this forum thread which add some important details the manual just doesn't mention.

VPN_ENDPOINT_PORT: Custom Wireguard server endpoint port to use.

It defaults to 443 for TCP and 1194 for UDP.VPN_ENDPOINT_PORT: Custom OpenVPN server endpoint port to use.It defaults to no, meaning it includes all servers. OWNED_ONLY: If the VPN server is owned by Mullvad.SERVER_HOSTNAMES: Comma separated list of server hostnames.SERVER_CITIES: Comma separated list of cities.SERVER_COUNTRIES: Comma separated list of countries.Note this is same value for all Mullvad servers and for your private key. This one should contain a comma delimited list of an IPv4 and IPv6 address, so use the IPv4 address (usually the first one) as the value for the WIREGUARD_ADDRESSES environment variable. In the configuration file, locate the Address value. To obtain it, first download a Wireguard configuration file using same steps as for WIREGUARD_PRIVATE_KEY above. WIREGUARD_ADDRESSES is the Wireguard IP network interface address in CIDR format xx.xx.xx.xx/xx.Note this value is the same for all Mullvad servers.

json files within and use the PrivateKey value. Generate a Wireguard configuration file, download the zip file, extract any of the. The Wireguard Key displayed on the Manage devices and ports page on Mullvad is not the private key that is required. The private key can only be obtained by generating a Wireguard configuration file.

WIREGUARD_PRIVATE_KEY is your 32 bytes key in base64 format.OPENVPN_USER which is your Mullvad user ID.SERVER_CITIES=Amsterdam Required environment variables WIREGUARD_PRIVATE_KEY=wOEI9rqqbDwnN8/Bpp22sVz48T71vJ4fYmFWujulwUU=

Mullvad custom dns