Cant access to Wesocket with domain on Express App

Hi all, I’m trying to make it work Express app on nodejs with Sockeio, I’m already opened ports on firewall, the api works, but the socket wont with the domain. I’m also tried with pm2, it works, but only from my VPS ip and port, won’t work from my domain name. If someone have the settings that I need to get this to work, please help!