Hey friend,

That is a bit of a tough call. Most likely you will want to check the log entry for the web server which correlates to the error received. The process of doing this is relative, so my example is likely to need interpretation through what is correct and relevant to you. This is what I would do:

First determine my IP address:
https://www.whatismyip.com/

For this example, let's say my IP is 1.1.1.1. Let's also say this is Apache on Ubuntu. I would then do this:

grep "1.1.1.1" /var/log/apache2/*

Check the time stamps for the relevant entry that matches when you received the error. You may see another error, and you can use it to search Google for that message. Pay close attention to results from stackoverflow.com, there are often great discussions there about specific error messages that result in action items you can take to resolve it.

Kind Regards,
Jarland