Frequent 502 error in nop commerce 4.0

I get frequent 502 error while product entry and otherwise too in 4.0 in any earlier version there was no such problem. A patch or something must be issued to deal with the problem. otherwise this package cannot to used for important web stores, it will not be reliable.

The error is
502- Web server received an invalid response while acting as a gateway or proxy server
there is a problem with the page you are looking for, and it cannot be displayed. When the web server( while acting as gateway content server, it received an invalid response from content server

This is not a nopcommerce issue.

You should talk to your hosting provider.

The HyperText Transfer Protocol (HTTP) 502 Bad Gateway server error response code indicates that the server, while acting as a gateway or proxy, received an invalid response from the upstream server.

Having the same problem. Hosting with Godaddy since version 2.9, never had this problem before until installing version 4.0 I cannot believe this is a hosting issue. If it is then please show some evidence.

I do not know much about your situation, but we are also having 502 responses occur consistently within 4.0. In our case, it is related to discounts for customers who spend over a certain amount, when applied to products/categories. It is happening consistently when a customer is successfully applying the corresponding coupon code to their cart.

Please find the solution at https://www.nopcommerce.com/boards/t/51769/server-error-502-web-server-received-an-invalid-response-while-acting-as-a-gateway-or-proxy-server.aspx#245411