diff --git a/nginx/https.template b/nginx/https.template
index 80420e7..1f26232 100644
--- a/nginx/https.template
+++ b/nginx/https.template
@@ -36,7 +36,7 @@ server {
 
     location /upload/ {
         client_max_body_size 16M;
-        proxy_pass http://localhost:${SNIKKET_TWEAK_INTERNAL_HTTP_PORT};
+        proxy_pass http://${SNIKKET_TWEAK_INTERNAL_HTTP_HOST}:${SNIKKET_TWEAK_INTERNAL_HTTP_PORT};
         proxy_set_header  Host            $host;
         proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header  X-Forwarded-Proto https;
diff --git a/nginx/snikket-common.template b/nginx/snikket-common.template
index 9b22e2f..558a97b 100644
--- a/nginx/snikket-common.template
+++ b/nginx/snikket-common.template
@@ -29,14 +29,14 @@ location /upload {
 }
 
 location @portal {
-	proxy_pass http://localhost:${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_PORT};
+	proxy_pass http://${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_HOST}:${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_PORT};
 	proxy_set_header  Host            $host;
 	proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
 	proxy_set_header  X-Forwarded-Proto https;
 }
 
 location @prosody {
-	proxy_pass http://localhost:${SNIKKET_TWEAK_INTERNAL_HTTP_PORT};
+	proxy_pass http://${SNIKKET_TWEAK_INTERNAL_HTTP_HOST}:${SNIKKET_TWEAK_INTERNAL_HTTP_PORT};
 	proxy_set_header  Host            $host;
 	proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
 	proxy_set_header  X-Forwarded-Proto https;
diff --git a/render-template.sh b/render-template.sh
index 1c1a72b..76c8efd 100755
--- a/render-template.sh
+++ b/render-template.sh
@@ -1,10 +1,17 @@
 #!/bin/bash
 
-export SNIKKET_TWEAK_HTTP_PORT=${SNIKKET_TWEAK_HTTP_PORT-80}
-export SNIKKET_TWEAK_HTTPS_PORT=${SNIKKET_TWEAK_HTTPS_PORT-443}
+# Prosody host/port
+export SNIKKET_TWEAK_INTERNAL_HTTP_HOST=${SNIKKET_TWEAK_INTERNAL_HTTP_HOST-localhost}
 export SNIKKET_TWEAK_INTERNAL_HTTP_PORT=${SNIKKET_TWEAK_INTERNAL_HTTP_PORT-5280}
+
+# Portal host/port
+export SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_HOST=${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_HOST-localhost}
 export SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_PORT=${SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_PORT-5765}
 
-exec envsubst '$SNIKKET_DOMAIN $SNIKKET_TWEAK_HTTP_PORT $SNIKKET_TWEAK_HTTPS_PORT $SNIKKET_TWEAK_INTERNAL_HTTP_PORT $SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_PORT' \
+# External ports
+export SNIKKET_TWEAK_HTTP_PORT=${SNIKKET_TWEAK_HTTP_PORT-80}
+export SNIKKET_TWEAK_HTTPS_PORT=${SNIKKET_TWEAK_HTTPS_PORT-443}
+
+exec envsubst '$SNIKKET_DOMAIN $SNIKKET_TWEAK_HTTP_PORT $SNIKKET_TWEAK_HTTPS_PORT $SNIKKET_TWEAK_INTERNAL_HTTP_PORT $SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_PORT $SNIKKET_TWEAK_INTERNAL_HTTP_HOST $SNIKKET_TWEAK_PORTAL_INTERNAL_HTTP_HOST' \
   < "$1" \
   > "$2";