Config page /s/config/edit returning 404 after 5000ms

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This might be due to a bad setting in your configuration. For some reason Mautic tries to test various email/SMS host settings when it loads the configuration settings page for display. Please see my post below for more information and a solution:

Configuration Page & SMS Channel cannot be accessed after SMS segment message created

I just want to concur that I had what seems like the exact same situation, using Mautic v3.3.1. Having a wrong host entered into a configuration field completely hung the entire configuration part of Mautic. Thanks to this post from EJL, I realized what it was. I had mistyped my host address for my monitored email. It was never able to connect, which I guess Mautic tries to do each time before it displays the configuration menu. I had to fix the error directly in the app/config/local.php. …