nginx, Wordpress rewrite rule -> letsencrypt check fails

Hi folks,

I have an Ubuntu 16.04 / ISPConfig 3.1 system, current patches, running with multiple web sites, all have letsencrypt certificates.
The one site failing to renew its certificate is a Wordpress blog, which has the following rewrite rule in Options -> "nginx directives":

Code:

if (!-e $request_filename)
{
rewrite ^(.+)$ /index.php?q=$1 last;
}

This makes "pretty URLs" work for Wordpress (i.e. "https://the.site/the-blog-entry"), but it also prevents the ISPConfig check for "/.well-known/acme-challenge/[request-code].txt", as it runs into a 404.

How can I still have the pretty URL rewrite working, but make an exception for the letsencrypt request?
Thanks in advance for any ideas.

 

We normally just use this code in nginx directives to make it works without affecting Lets Encrypt:

Code:

       location / {
           try_files $uri $uri/ /index.php?q=$uri&$args;
       }