Blynk Network Port Forward Config

Derek Colley
2 min readJul 2, 2021

Port forwarding & proxy config for Blynk Server

Blynk app for monitoring Solar Charge

I’m using blynk server (local) to monitor the state-of-charge of a battery that’s connected to a solar panel.

To get the app working from inside the local network and outside when I’m travelling, we need to configure DNS and port forwarding as follows.

Note 1:

Note 2:

  • please decide for yourself whether exposing this service to the internet is a good thing…? Perhaps you prefer a VPN solution, then your device can simply access internal services when connected.


  • DNS external and internal (dnsmasq on docker)
  • router — internet connection, port forwarding
  • nginx (docker) — proxy traffic to the blynk server
  • Blynk Server (local, docker) — note, local server is now deprecated. decided to discontinue the product.
  • apache — I was not able to get apache to proxy the stream

External DNS

  • => (my external ip address)

Internal DNS

  • => (internal ip of server on vm/docker)
  • => (internal ip of nginx)

Router port forwarding

  • 8080 => (optional, if you want devices in the wild)
  • 8444 => (stream, for the app)
  • 8443 => (https, for admin pages)

nginx config

Forward both 8444 (blynk proto) and 8443 (https) to the Blynk server

events {}stream {
upstream blynkserver {
server {
listen 8444;
proxy_pass blynkserver;
http {
server {
# Server configuration
listen 80 default_server;
return 301 https://$host$request_uri;
server {
listen 8443;
ssl on;
ssl_certificate ssl/;
ssl_certificate_key ssl/;
ssl_session_cache builtin:1000 shared:SSL:10m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
location / {
proxy_ssl_verify off;

Blynk.App config

At the login add

  • custom domain
  • port 8444

The app should now work on local wifi and on 4G.

Access the admin screens on

Happy blynking..!

Alternative (simpler) solution

Although the solution above is somewhat complex, it allows me to use the same domain+port for internal and external purposes.

If you simply want to access your blynk server from the internet, just forward homeip:8443 to — but you already knew that… ;)