diff --git a/playbooks/files/chaosknoten/configs/public-reverse-proxy/nginx/acme_challenge.conf b/playbooks/files/chaosknoten/configs/public-reverse-proxy/nginx/acme_challenge.conf
index 573d484..4dab635 100644
--- a/playbooks/files/chaosknoten/configs/public-reverse-proxy/nginx/acme_challenge.conf
+++ b/playbooks/files/chaosknoten/configs/public-reverse-proxy/nginx/acme_challenge.conf
@@ -14,6 +14,7 @@ map $host $upstream_acme_challenge_host {
     next.hamburg.ccc.de 172.31.17.151:31820;
     spaceapi.hamburg.ccc.de 172.31.17.151:31820;
     zammad.hamburg.ccc.de 172.31.17.152:31820;
+    c3cat.de 172.31.17.151:31820;
     default "";
 }
 
diff --git a/playbooks/files/chaosknoten/configs/public-reverse-proxy/nginx/nginx.conf b/playbooks/files/chaosknoten/configs/public-reverse-proxy/nginx/nginx.conf
index 328a75b..af27fc6 100644
--- a/playbooks/files/chaosknoten/configs/public-reverse-proxy/nginx/nginx.conf
+++ b/playbooks/files/chaosknoten/configs/public-reverse-proxy/nginx/nginx.conf
@@ -32,6 +32,7 @@ stream {
         branding-resources.hamburg.ccc.de 172.31.17.151:8443;
         next.hamburg.ccc.de 172.31.17.151:8443;
         zammad.hamburg.ccc.de 172.31.17.152:8443;
+        c3cat.de 172.31.17.151:8443;
     }
 
     server {