FTP: When the client logs in to the FTP server, the server returns the version information of the FTP server to the client. Attackers can launch attacks by exploiting the vulnerabilities of corresponding versions. This function prevents attacks by hiding the version information returned by the FTP server. Select FTP to enable this function.

HTTP: When a client visits a website, the server will return many fields of the client in the HTTP header, such as Server, Via, etc. The version of the proxy server may be revealed by Via and may be exploited to launch attacks. Such attacks can be prevented by hiding these fields. Select HTTP and click Settings. Then, the following dialog box will appear.

Enable Hide specified fields in HTTP response header and customize the content of the HTTP header. You can use HTTPWATCH or other packet-capturing tools to capture some fields returned by the server to the client and enter them here. Select Replace server error page (5xx).

Error pages, like a page where the server returns error code 500 (server information included), will be replaced by the firewall with an error page that does not contain server information.