nginx caching issue

Hello,

I tried to improve my nginx confiugration. I can’t login via /wp-admin weather wp-login.php. Actually I got no clue, I got a white screen by this url:

wp-login.php?redirect_to=https%3A%2F%2Fdomain-name.de%2Fwp-admin%2F&reauth=1

This is my nginx configuration at the moment:

limit_req_zone $http_x_forwarded_for zone=DIYB:20m rate=100r/s; # you missed line like this

fastcgi_cache_path /var/run/wordpress levels=1:2       
                   keys_zone=DIY:100m inactive=60m;
fastcgi_cache_key "$scheme$request_method$host$request_uri";

server {
  listen       *:443 ssl;

  server_name        domainname.de www.domainname.de;
  root               /var/www/domainname.de/wordpress;

  ssl on;

  index  index.php;

  access_log            /var/log/nginx/domainname.de_ssl_access.log combined;
  error_log             /var/log/nginx/domainname.de_ssl_error.log;

  location ~* \.(?:ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|css|rss|atom|js|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ {
    expires max;
    log_not_found off;
    access_log off;
  }

  
  # fast cgi cache
   set $skip_cache 0;

    # POST requests and URLs with a query string should always go to PHP
    if ($request_method = POST) {
        set $skip_cache 1;
    }   

    if ($query_string != "") {
        set $skip_cache 1;
    }   

    # Don't cache URIs containing the following segments
    if ($request_uri ~* "/wp-admin/|/xmlrpc.php|wp-.*.php|/feed/|index.php
                         |sitemap(_index)?.xml") {
        set $skip_cache 1;
    }   

    if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass
        |wordpress_no_cache|wordpress_logged_in") {
        set $skip_cache 1;
    }
 
    set $cache_uri $request_uri;

    if ($request_method = POST) {
        set $cache_uri 'null cache';
    }  
    if ($query_string != "") {
        set $cache_uri 'null cache';
    }   

    # Don't cache URIs containing the following segments
    if ($request_uri ~* "(/wp-admin/|/xmlrpc.php|/wp-(app|cron|login|register|mail).php
                          |wp-.*.php|/feed/|index.php|wp-comments-popup.php
                          |wp-links-opml.php|wp-locations.php |sitemap(_index)?.xml
                          |[a-z0-9_-]+-sitemap([0-9]+)?.xml)") {

        set $cache_uri 'null cache';
    }  
        
    # Don't use the cache for logged-in users or recent commenters
    if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+
                         |wp-postpass|wordpress_logged_in") {
        set $cache_uri 'null cache';
    }

    location = /favicon.ico {
        log_not_found off; 
        access_log off;
    }

    location = /robots.txt {
        log_not_found off;
        access_log off;
    }

    location ~ /\. {
      deny  all; 
      access_log off;
      log_not_found off;
    }

location ~* ^/wp-content/uploads/.*.(html|htm|shtml|php|js|swf)$ {
    deny all;
}

location ~* wp-config.php {
    deny all;
}

location = /wp-login.php {
  limit_req zone=DIYB burst=1 nodelay;
  fastcgi_pass  unix:/var/run/php-fpm/domainname.de.sock;
}

  location / {
    try_files /wp-content/cache/supercache/$http_host/$cache_uri/index.html 
            $uri $uri/ /index.php?$args;
    rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.xml$ "/index.php?xml_sitemap=params=$2" last;
    rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.xml\.gz$ "/index.php?xml_sitemap=params=$2;zip=true" last;
    rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.html$ "/index.php?xml_sitemap=params=$2;html=true" last;
    rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.html.gz$ "/index.php?xml_sitemap=params=$2;html=true;zip=true" last;
  }
  location ~ \.php$ {
    try_files $uri =404;
    root      /var/www/domainname.de/wordpress;
    include   /etc/nginx/fastcgi.conf;

    fastcgi_pass  unix:/var/run/php-fpm/domainname.de.sock;
    fastcgi_connect_timeout 3m;
    fastcgi_read_timeout 3m;
    fastcgi_send_timeout 3m;
    fastcgi_cache_bypass $skip_cache;
    fastcgi_no_cache $skip_cache;
    fastcgi_cache DIY;
    fastcgi_cache_valid  60m;
  }

  include /etc/nginx/snippets/letsencrypt.conf;
}