diff --git a/custom/proxy/config/error_pages/50x.html b/custom/proxy/config/error_pages/unavailable.html
similarity index 100%
rename from custom/proxy/config/error_pages/50x.html
rename to custom/proxy/config/error_pages/unavailable.html
diff --git a/custom/proxy/config/nginx.tmpl b/custom/proxy/config/nginx.tmpl
index ae6c01f..f14ee70 100644
--- a/custom/proxy/config/nginx.tmpl
+++ b/custom/proxy/config/nginx.tmpl
@@ -294,8 +294,8 @@ server {
 {{- end }}
     {{ $globals.access_log }}
 
-    error_page 503 /50x.html;
-    location = /50x.html {
+    error_page 503 /unavailable.html;
+    location = /unavailable.html {
         root /usr/share/nginx/html;
     }
     location / {