diff --git a/hosts/nextcloud/default.nix b/hosts/nextcloud/default.nix
index 304becf..80c0bb3 100644
--- a/hosts/nextcloud/default.nix
+++ b/hosts/nextcloud/default.nix
@@ -87,6 +87,11 @@
     recommendedProxySettings = true;
     recommendedTlsSettings = true;
 
+    commonHttpConfig = ''
+      real_ip_header proxy_protocol;
+      set_real_ip_from 141.56.51.1/32;
+    '';
+
     logError = ''
       /dev/null emerg
     '';
@@ -94,9 +99,21 @@
     virtualHosts.${config.networking.fqdn} = {
       forceSSL = true;
       enableACME = true;
-      extraConfig = ''
-        access_log off;
-      '';
+      listen = [
+        {
+          port = 80;
+          addr = "0.0.0.0";
+        }
+        {
+          port = 443;
+          addr = "0.0.0.0";
+          ssl = true;
+          proxyProtocol = true;
+        }
+      ];
+      # extraConfig = ''
+      #   access_log off;
+      # '';
     };
     # virtualHosts."cloud.htw.stura-dresden.de" = {
     #   forceSSL = true;
diff --git a/hosts/proxy/default.nix b/hosts/proxy/default.nix
index 52c9d82..a806790 100644
--- a/hosts/proxy/default.nix
+++ b/hosts/proxy/default.nix
@@ -98,108 +98,112 @@
           domain = "docs.adm.htw.stura-dresden.de";
           httpPort = 8080;
           httpsPort = 8443;
+          sendProxy = false;
         };
         plone = {
           dest = "141.56.51.3";
           domain = "stura.htw-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         plone_alt = {
           dest = "141.56.51.3";
           domain = "www.stura.htw-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         plone_neu = {
           dest = "141.56.51.3";
           domain = "www.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         plone_neu2 = {
           dest = "141.56.51.3";
           domain = "htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         tix = {
           dest = "141.56.51.220";
           domain = "tix.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         post = {
           dest = "141.56.51.56";
           domain = "post.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         vot = {
           dest = "141.56.51.57";
           domain = "vot.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         mail = {
           dest = "141.56.51.14";
           domain = "mail.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         lists = {
           dest = "141.56.51.14";
           domain = "lists.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         dat = {
           dest = "141.56.51.17";
           domain = "dat.stu.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
-        };
-        pro = {
-          dest = "141.56.51.15";
-          domain = "pro.htw.stura-dresden.de";
-          httpPort = 80;
-          httpsPort = 443;
-        };
-        cloud = {
-          dest = "141.56.51.16";
-          domain = "cloud.htw.stura-dresden.de";
-          httpPort = 80;
-          httpsPort = 443;
+          sendProxy = false;
         };
         wiki = {
           dest = "141.56.51.13";
           domain = "wiki.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = true;
         };
         beach = {
           dest = "141.56.51.51";
           domain = "beach.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         studicloud = {
           dest = "141.56.51.17";
           domain = "dat.stu.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         bbb = {
           dest = "141.56.51.94";
           domain = "bbb.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
         bbb-test = {
           dest = "141.56.51.94";
           domain = "bbb.test.htw.stura-dresden.de";
           httpPort = 80;
           httpsPort = 443;
+          sendProxy = false;
         };
       }
       # zusätzlich zu den oben definierten wird hier noch ein redirect für jeden nginx virtualhost in diese flake generiert
@@ -218,6 +222,15 @@
           prev
           // (builtins.foldl' (
             val: vhost:
+            let
+              proxyProtocol =
+                if
+                  self.nixosConfigurations.${name}.config.services.nginx.virtualHosts.${vhost}.listen == [ ]
+                then
+                  false
+                else
+                  true;
+            in
             val
             // {
               "${vhost}" = {
@@ -225,6 +238,7 @@
                 domain = vhost;
                 httpsPort = 443;
                 httpPort = 80;
+                sendProxy = proxyProtocol;
               };
             }
           ) { } vhosts)
@@ -525,7 +539,9 @@
                 option tcpka  # Enable server TCP keep-alive (Phase 4)
                 timeout server 60s  # Increase from 30s for long-lived HTTPS
                 timeout connect 3s  # Reduce from 5s (local network)
-                server ${name} ${value.dest}:${builtins.toString value.httpsPort} check inter 3000 rise 2 fall 3 maxconn 5000
+                server ${name} ${value.dest}:${builtins.toString value.httpsPort} ${
+                  if value.sendProxy == true then "send-proxy-v2" else ""
+                } check inter 3000 rise 2 fall 3 maxconn 5000
 
             ''
           ) "" forwards}
diff --git a/hosts/redmine/default.nix b/hosts/redmine/default.nix
index 6bc3d5e..3e3e183 100644
--- a/hosts/redmine/default.nix
+++ b/hosts/redmine/default.nix
@@ -137,10 +137,26 @@
   services.nginx.appendHttpConfig = ''
     access_log off;
   '';
+  services.nginx.commonHttpConfig = ''
+    real_ip_header proxy_protocol;
+    set_real_ip_from 141.56.51.1/32;
+  '';
 
 ####    Anscheinend kann mit nix nur die Konfiguration fuer eine konkrete (manuelle) Konfiguration fuer den Dienst web server.
   services.nginx.virtualHosts."${config.networking.fqdn}" = {
 ####		https://search.nixos.org/options?show=services.nginx.virtualHosts.<name>.default
+      listen = [
+        {
+          port = 80;
+          addr = "0.0.0.0";
+        }
+        {
+          port = 443;
+          addr = "0.0.0.0";
+          ssl = true;
+          proxyProtocol = true;
+        }
+      ];
     default = true;
     locations."/" = {
       proxyPass = "http://127.0.0.1:${toString config.services.redmine.port}";
diff --git a/hosts/wiki/default.nix b/hosts/wiki/default.nix
index bd8bbb6..c73a5cb 100644
--- a/hosts/wiki/default.nix
+++ b/hosts/wiki/default.nix
@@ -99,6 +99,17 @@
   services.mediawiki.database.passwordFile = "/var/lib/mediawiki/mediawiki-dbpassword";
 
 
+  services.httpd = {
+    extraModules = [ "remoteip" ];
+
+    extraConfig = ''
+      # Trust HAProxy's address (adjust to your HAProxy IP/subnet)
+      RemoteIPProxyProtocol On
+      # RemoteIPProxyProtocolExceptions 127.0.0.1 ::1
+
+      RemoteIPTrustedProxy 141.56.51.1/32
+    '';
+  };
 ####	2024-02-17 vater:
 ####		trace: warning: The option `services.mediawiki.virtualHost' defined in `/etc/nixos/configuration.nix' has been renamed to `services.mediawiki.httpd.virtualHost'.
 #  services.mediawiki.virtualHost.hostName = "wiki.stura.htw-dresden.de";
@@ -150,8 +161,8 @@
     Lockdown = pkgs.fetchzip {
 #      url = "https://extdist.wmflabs.org/dist/extensions/Lockdown-REL1_43-7ac8966.tar.gz";
       # url = "https://extdist.wmflabs.org/dist/extensions/Lockdown-REL1_44-af1f4df.tar.gz";
-      url = "https://extdist.wmflabs.org/dist/extensions/Lockdown-REL1_45-a46dbea.tar.gz";
-      sha256 = "sha256-zTTpbQiqudLILPSzmKGjKr6wZjh0YUttGmqwjPpAToc=";
+      url = "https://extdist.wmflabs.org/dist/extensions/CategoryLockdown-REL1_45-a715472.tar.gz";
+      sha256 = "sha256-1gl5m9xkmLrdjoR0M13gcQHLtZt4Bt0PUXDiDEqjpvk=";
     };
 
 	####	Hinzufuegen der Erweiterung ConfirmEdit fuer eine zusaetzliche Bestaetigung bei Bearbeitungen, etwa um Herausforderungen (aka CAPTCHA) zu stellen
@@ -168,8 +179,8 @@
 	####	Hinzufuegen der Erweiterung ContributionScores fuer eine Statistik von Beitraegen nach Beitragenden
 	####	https://www.mediawiki.org/wiki/Extension:ContributionScores
     ContributionScores = pkgs.fetchzip {
-      url = "https://extdist.wmflabs.org/dist/extensions/ContributionScores-REL1_45-cd4c94b.tar.gz";
-      sha256 = "sha256-8ClNtEQ66deKM1DsRYaaZ3KlRl4yCt6UhpXcozRQzQ8=";
+      url = "https://extdist.wmflabs.org/dist/extensions/ContributionCredits-REL1_45-22c28de.tar.gz";
+      sha256 = "sha256-9T67jCEYQyU7P9sN7tYbnevU5+FX6Y1nydXGEdzQS9k=";
     };
 
 	####	Hinzufuegen der Erweiterung Interwiki fuer das Verwenden von Verweisen als eine Art Namensraum, wie beispielweise auf Wikipedia oder selbst festgelegte Verweise
@@ -190,8 +201,8 @@
 	####	https://www.mediawiki.org/wiki/Extension:UserMerge
     UserMerge = pkgs.fetchzip {
 #      url = "https://extdist.wmflabs.org/dist/extensions/UserMerge-REL1_43-ed4a689.tar.gz";
-      url = "https://extdist.wmflabs.org/dist/extensions/UserMerge-REL1_45-446566b.tar.gz";
-      sha256 = "sha256-DTDKlzet3lThh/sRLucyb8b9lhK5FYZ+dMgwrThFFBM=";
+      url = "https://extdist.wmflabs.org/dist/extensions/UserMerge-REL1_45-437c211.tar.gz";
+      sha256 = "sha256-DWdcvubqZkvtywuDEOjui68WYuETt5hGpJJlpZ+pJgE=";
     };
   };