Never cache dynamic file

Thanks for your quick reply. I've configured EE to use Fast Cache. It's a WordPress install but has completely bespoke auth pages.

You mentioning this however made me do a little digging. I've actually just setup a custom config file with a caching rule which I think will have fixed my issue without changing core nginx files -

cache_rules.conf -

if ($request_uri ~* "(/account/(?:login|resetpw|))/") {
  set $skip_cache 1;
}

Thank you,
Chris.