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by abatilo 1156 days ago
In 2017, I worked at a company that built a websocket based app and ran it on Heroku. We had this exact same problem and all 5 of the engineers at the time spent all day until we realized that we had socket connections still connected to some "ghost dyno".

I can't remember exactly what we did but I think we just kept deploying over and over again until the old one finally went away.