Fixing Timeout Errors is hard to find #3100
Description
A lot of customers still have trouble finding why their applications are crashing when booting. In a lot of case, it's because they are listening the wrong IP (!= 0.0.0.0) or Port (not listening $PORT). This part is already documented: https://doc.scalingo.com/platform/app/crash#understanding-timeout-errors but looks hard to find.