How to solve website not loading or 503 error on website

This usually happens due to application pool is getting crashed,
it mostly crashes when if there are a huge number of real-time visitors or may be a bug in a code that might be creating a loop,
please verify your code once.

You can also restart your application pool for a particular domain using the following steps

  1.  Login to Plesk control panel.
  2.  select a site that you want to restart the application pool.

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