diff --git a/contrib/apache2/zammad.conf b/contrib/apache2/zammad.conf
index 7d9eeb5e0..8a15a3b97 100644
--- a/contrib/apache2/zammad.conf
+++ b/contrib/apache2/zammad.conf
@@ -18,15 +18,15 @@
     ProxyRequests Off
     ProxyPreserveHost On
 
-    <Proxy localhost:3000>
+    <Proxy 127.0.0.1:3000>
 	Require local
     </Proxy>
 
     ProxyPass /assets !
     ProxyPass /favicon.ico !
     ProxyPass /robots.txt !
-    ProxyPass /ws ws://localhost:6042/
-    ProxyPass / http://localhost:3000/
+    ProxyPass /ws ws://127.0.0.1:6042/
+    ProxyPass / http://127.0.0.1:3000/
 
     DocumentRoot "/opt/zammad/public"
 
diff --git a/contrib/apache2/zammad_ssl.conf b/contrib/apache2/zammad_ssl.conf
index b9c23f8b9..84f352656 100644
--- a/contrib/apache2/zammad_ssl.conf
+++ b/contrib/apache2/zammad_ssl.conf
@@ -37,21 +37,21 @@
     ProxyRequests Off
     ProxyPreserveHost On
 
-    <Proxy localhost:3000>
+    <Proxy 127.0.0.1:3000>
       Require local
     </Proxy>
 
     ProxyPass /assets !
     ProxyPass /favicon.ico !
     ProxyPass /robots.txt !
-    ProxyPass /ws ws://localhost:6042/
-    ProxyPass / http://localhost:3000/
+    ProxyPass /ws ws://127.0.0.1:6042/
+    ProxyPass / http://127.0.0.1:3000/
     
     # Use settings below if proxying does not work and you receive HTTP-Errror 404
     # if you use the settings below, make sure to comment out the above two options
     # This may not apply to all systems, applies to openSuse
-    #ProxyPass /ws ws://localhost:6042/ "retry=1 acque=3000 timeout=600 keepalive=On"
-    #ProxyPass / http://localhost:3000/ "retry=1 acque=3000 timeout=600 keepalive=On"
+    #ProxyPass /ws ws://127.0.0.1:6042/ "retry=1 acque=3000 timeout=600 keepalive=On"
+    #ProxyPass / http://127.0.0.1:3000/ "retry=1 acque=3000 timeout=600 keepalive=On"
 
     DocumentRoot "/opt/zammad/public"
 
diff --git a/contrib/nginx/zammad.conf b/contrib/nginx/zammad.conf
index c635dba6d..72c59cdf3 100644
--- a/contrib/nginx/zammad.conf
+++ b/contrib/nginx/zammad.conf
@@ -3,11 +3,11 @@
 #
 
 upstream zammad-railsserver {
-    server localhost:3000;
+    server 127.0.0.1:3000;
 }
 
 upstream zammad-websocket {
-    server localhost:6042;
+    server 127.0.0.1:6042;
 }
 
 server {
diff --git a/contrib/nginx/zammad_ssl.conf b/contrib/nginx/zammad_ssl.conf
index d7a43f285..47457cdec 100644
--- a/contrib/nginx/zammad_ssl.conf
+++ b/contrib/nginx/zammad_ssl.conf
@@ -9,11 +9,11 @@
 #
 
 upstream zammad-railsserver {
-  server localhost:3000;
+  server 127.0.0.1:3000;
 }
 
 upstream zammad-websocket {
-  server localhost:6042;
+  server 127.0.0.1:6042;
 }
 
 server {