Device "proton0" does not exist.

[fab5436]

any ideas? removed the container completly and added again:

[Psychodelic42]

looks like you are using ugos.
connect to the nas via ssh and start the docker manually:
e.g.:

docker run -d \
   --dev=/dev/net/tun --cap-add=NET_ADMIN \
   -v /etc/localtime:/etc/localtime:ro \
   -p 8888:8080 \
   -e PVPN_USERNAME= xxxxxxxxxxxxxx \
   -e PVPN_PASSWORD=xxxxxxxxxxxxxxx \
   -e HOST_NETWORK=10.0.0.0/8 \
   --sysctl net.ipv6.conf.all.disable_ipv6=1 \
   --sysctl net.ipv6.conf.default.disable_ipv6=1 \
   --sysctl net.ipv6.conf.lo.disable_ipv6=1 \
   --name proton-privoxy walt3rl/proton-privoxy