diff --git a/docker/images/files/nginx.conf b/docker/images/files/nginx.conf
index 8d0fff0a2..fee0e3fca 100644
--- a/docker/images/files/nginx.conf
+++ b/docker/images/files/nginx.conf
@@ -38,7 +38,10 @@ http {
 
     gzip_types text/plain text/css text/javascript application/javascript application/json application/transit+json;
 
-    resolver $PENPOT_INTERNAL_RESOLVER;
+    proxy_buffer_size 16k;
+    proxy_busy_buffers_size 24k; # essentially, proxy_buffer_size + 2 small buffers of 4k
+    proxy_buffers 32 4k;
+    resolver $PENPOT_INTERNAL_RESOLVER ipv6=off;
 
     map $http_upgrade $connection_upgrade {
         default upgrade;