It is very important to stay alert and spot any problems as soon as possible. Of course, monitoring the health of your site doesn't mean you have to visit it every 5 minutes; this means that you will need to use tools and applications to help with this task.
Some useful tools you can rely on are Pingdom, Uptime Robot, and Monitor Us. Whichever tool you choose, you need to calibrate them to track the following items: Ping, HTTP, DNS b2b email list Server and TCP Port.
One thing you really need to keep in mind when switching servers is the possible loss or misplacements of assets such as graphics. This could be due to a change in the hosting environment, and it is possible that you will see multiple 404 (not found) errors. So, just be on the lookout and monitor your 404 logs to see if there are broken links or broken resources. When you find them, they may need a quick repair or replacement and you should be fine.
Another way to deal with this problem is to redirect from the 404 page to another page that is already working. This is not a solution to the problem, of course, it is just an alternative to displaying a 404 page.