diff --git a/docker/nginx/conf.d/server/server.api b/docker/nginx/conf.d/server/server.api
index c57ef789..11a3ee75 100644
--- a/docker/nginx/conf.d/server/server.api
+++ b/docker/nginx/conf.d/server/server.api
@@ -60,7 +60,7 @@ location /skynet/portal/blocklist {
     add_header X-Proxy-Cache $upstream_cache_status;
 
     proxy_cache skynet;
-    proxy_cache_valid any 15m; # cache portal blocklist for 15 minutes
+    proxy_cache_valid 200 204 15m; # cache portal blocklist for 15 minutes
     proxy_pass http://blocker:4000/blocklist;
 }