The hub cannot start because: "SEVERE: Port 4444 is busy, please choose a free port..." (the port is not in use) · Issue #742 · SeleniumHQ/docker-selenium · GitHub
![Deckboard defaults to port 4444 no matter what you enter · Issue #284 · rivafarabi/deckboard · GitHub Deckboard defaults to port 4444 no matter what you enter · Issue #284 · rivafarabi/deckboard · GitHub](https://user-images.githubusercontent.com/45405525/67063001-68938500-f165-11e9-9e1a-1a2c7a8bdbd0.png)
Deckboard defaults to port 4444 no matter what you enter · Issue #284 · rivafarabi/deckboard · GitHub
![r - How to resolve RSelenium error message "Failed to connect to localhost port 4444: Connection refused"? - Stack Overflow r - How to resolve RSelenium error message "Failed to connect to localhost port 4444: Connection refused"? - Stack Overflow](https://i.stack.imgur.com/DUmFs.png)
r - How to resolve RSelenium error message "Failed to connect to localhost port 4444: Connection refused"? - Stack Overflow
![networking - Port is locally opened but not detected by internet port checkers, something is wrong with port forwarding? - Super User networking - Port is locally opened but not detected by internet port checkers, something is wrong with port forwarding? - Super User](https://i.stack.imgur.com/0oO2I.png)