Update IIS-ARR-Reverse-Proxy.md (#21)

Adding server port breaks csrf.
Server variables are with underscores.

IIS-ARR-Reverse-Proxy.md

@@ -6,8 +6,8 @@ For users that run qBittorrent via Microsoft IIS as a reverse proxy some extra h
 4. Create a new site that will handle the reverse proxy requests
 5. Select the site and then open **URL Rewrite**
 6. On the right hand side, open **View Server Variables**
-7. Click **Add** and in the box that appears enter `HTTP_X-Forwarded-Host`
-8. Repeat this for `HTTP_X-Forwarded-For` and `RESPONSE_Set_Cookie`
+7. Click **Add** and in the box that appears enter `HTTP_X_Forwarded_Host`
+8. Repeat this for `HTTP_X_Forwarded_For` and `RESPONSE_Set_Cookie`
 9. Return to the rules page
 10. Open **Add Rules** and select **Reverse Proxy**
 11. Enter the server IP:Port without `http://` (for example `127.0.0.1:8080`), then click **OK**
@@ -16,8 +16,8 @@ For users that run qBittorrent via Microsoft IIS as a reverse proxy some extra h
 
     | Server variable name  | Value                     |
     | --------------------- | ------------------------- |
-    | HTTP_X-Forwarded-Host | {HTTP_HOST}:{SERVER_PORT} |
-    | HTTP_X-Forwarded-For  | {REMOTE_ADDR}             |
+    | HTTP_X_Forwarded_Host | {HTTP_HOST}               |
+    | HTTP_X_Forwarded_For  | {REMOTE_ADDR}             |
 
 14. Apply and return to the rules page
 15. Open **Add Rules** and select **Blank rule** under **Outbound rules**
@@ -35,8 +35,8 @@ The result should look similar to this in your web.config (Note: you must use th
                     <match url="qbweb/(.*)" />
                     <action type="Rewrite" url="http://127.0.0.1:8080/{R:1}" />
                     <serverVariables>
-                        <set name="HTTP_X-Forwarded-Host" value="{HTTP_HOST}:{SERVER_PORT}" />
-                        <set name="HTTP_X-Forwarded-For" value="{REMOTE_ADDR}" />
+                        <set name="HTTP_X_Forwarded_Host" value="{HTTP_HOST}" />
+                        <set name="HTTP_X_Forwarded_For" value="{REMOTE_ADDR}" />
                     </serverVariables>
                 </rule>
             </rules>
@@ -48,8 +48,6 @@ The result should look similar to this in your web.config (Note: you must use th
             </outboundRules>
 ```
 
-Additionally you must untick **Enable Cross-Site Request Forgery (CSRF) protection** in qBittorrent's Web UI options for the reverse proxy to work.
-
 You can use HTTPS to access the URL via IIS and it will use HTTP to communicate with qBittorrent. There is no need for HTTPS on localhost.
 
 Note: If you find yourself seeing `WebAPI login failure. Reason: IP has been banned, IP: 127.0.0.1` and needing to restart qBittorrent, you may want to set the ban after failure count to `0` which will disable it.