site - is currently unable to handle this request Http error 500 [closed]

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once i clicked on "Proceed to checkout" button, we are getting below error

The sitename.com is't working
www.sitename.co.nz is currently unable to handle this request
Http Error 500

even in backend when we open some orders, than also same error in order-view page.

we are using hostgator for shared hosting.

Edit

It was the problem with one of checkout related file reset to 000 permission. once i gave 644 permission, it again start to work. but this problem is happening frequently.

why file is resetting to 000 permission

Answer 1

500 errors should be in the webservice error log or possibly a PHP error log if you have one. It could be any number of things and its impossible to diagnose from the frontend, unfortunately. HG support might be able to provide access to those logs.