diff --git a/core/nginx/conf/nginx.conf b/core/nginx/conf/nginx.conf
index 3c7dbc35..9aab226b 100644
--- a/core/nginx/conf/nginx.conf
+++ b/core/nginx/conf/nginx.conf
@@ -232,6 +232,11 @@ http {
         proxy_set_header X-Real-IP "";
         proxy_set_header X-Forwarded-For "";
         proxy_pass http://$antispam;
+        error_page 403 @antispam_login;
+      }
+
+      location @antispam_login {
+        return 302 /sso/login?url=$request_uri;
       }
       {% endif %}