Troubleshooting Tip: How to fix error 'ERR_EMPTY_RESPONSE'

[Ahmed_Galal]

Description	This article describes how to troubleshoot a non-working connection with the error 'Empty Response'.
Scope	FortiWeb.
Solution	In some scenarios, after configuring a security policy on FortiWeb and testing its connection, the browser returns the following error:   The error 'err_empty_response' usually occurs when the backend server is hosting multiple domains and is expecting the SNI extension in the Client Hello message of the TLS handshake. In a Wireshark capture the backend server will not respond to the HTTP request, resulting in the 'Empty Response' error.   How to fix the 'ERR_EMPTY_RESPONSE' Error: On FortiWeb, enable SNI in the backend server: Go to Server Objects -> Server Pool. Select the related server pool. Edit the pool member. Enable 'Enable Server Name Indication(SNI) Forwarding' under 'Advanced SSL settings'.   config server-policy server-pool     edit <server-pool_name>         config pserver-list             edit <entry_index>                 set server-side-sni enable             next         end