Make it work for /admin/antispam too

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 %}