ServerName mail.domain.tld
 
ProxyRequests Off 
 
SSLStrictSNIVHostCheck Off 
SSLEngine on
 
 
SSLProxyEngine On
SSLProxyCheckPeerCN Off
SSLProxyCheckPeerName Off 
SSLProxyVerify none 
 
 
ProxyPass / https://192.168.1.10/         -> My server ip address
ProxyPassReverse / https://192.168.1.10/
ProxyPreserveHost On
 
RewriteCond %{HTTPS} off 
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} 

server {
	listen	443 ssl http2;
	include /etc/nginx/conf.d/ssl.conf;
	
	location / {
		proxy_pass MyKerioConnectIP;
		client_max_body_size 0;
		proxy_http_version 1.1;
		proxy_next_upstream timeout error;
		proxy_read_timeout 4000;
		proxy_set_header Connection "";
		proxy_set_header    X-Real-IP           $remote_addr;
		proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
		proxy_set_header    X-Forwarded-Proto   $scheme;
		proxy_set_header    Host                $host;
		proxy_set_header    X-Forwarded-Host    $host;
		proxy_set_header    X-Forwarded-Port    $server_port;
		proxy_set_header 	X-Request-Start		$msec;

	}
}

[03/Mar/2020 15:56:42] HTTP/ActiveSync: Invalid password for user xxxxxx. Attempt from IP address 10.0.0.18.

  <variable name="UseProxiedInfo">1</variable>
  <variable name="TrustedProxyAddressGroup">Proxy</variable>

  <listitem>
    <variable name="Name">Proxy</variable>
    <variable name="Value">192.168.1.218/255.255.255.0</variable>
    <variable name="Enabled">1</variable>
    <variable name="Desc">Proxy</variable>
    <variable name="Guid">e0960fb1-7aa3-4da7-bfa9-fca6771d65dd</variable>
    <variable name="GroupGuid">267f75df-dd79-4752-8b19-96e6019fcad5</variable>
  </listitem>