What is the cause of 500/503 error in Apache/Mono? -

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i have web services deployed in apache/mono server in production. working fine, sometime throws 500 error(internal server error) in apache log in random manner (i.e., throws error irrespective of web service) , consequent service calls after throws 503(service temp unavailable) error, makes apache/mono crashed. need restart apache/mono run service.

so question

  1. what cause of 500 error (internal server error)?
  2. what cause of 503 error (server temp unavilable)?
  3. is errors caused due memory overflow in server?
  4. is problem due apache configuration problem or code problem?


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