diff --git a/docker-compose.yaml b/docker-compose.yaml
index 7af052e..d788777 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -16,5 +16,6 @@ services:
       - 443:443
     volumes:
       - ${VOLUME_PATH}/conf.d:/etc/nginx/conf.d
+      - ${VOLUME_PATH}/letsencrypt-acme-challenge:/data/letsencrypt-acme-challenge
       - ${VOLUME_PATH}/etc/letsencrypt:/etc/letsencrypt
       - ${VOLUME_PATH}/tmp:/tmp
diff --git a/includes/letsencrypt-acme-challenge.conf b/includes/letsencrypt-acme-challenge.conf
new file mode 100644
index 0000000..ff2a782
--- /dev/null
+++ b/includes/letsencrypt-acme-challenge.conf
@@ -0,0 +1,30 @@
+# Rule for legitimate ACME Challenge requests (like /.well-known/acme-challenge/xxxxxxxxx)
+# We use ^~ here, so that we don't check other regexes (for speed-up). We actually MUST cancel
+# other regex checks, because in our other config files have regex rule that denies access to files with dotted names.
+location ^~ /.well-known/acme-challenge/ {
+	# Since this is for letsencrypt authentication of a domain and they do not give IP ranges of their infrastructure
+	# we need to open up access by turning off auth and IP ACL for this location.
+	auth_basic off;
+	auth_request off;
+	allow all;
+
+	# Set correct content type. According to this:
+	# https://community.letsencrypt.org/t/using-the-webroot-domain-verification-method/1445/29
+	# Current specification requires "text/plain" or no content header at all.
+	# It seems that "text/plain" is a safe option.
+	default_type "text/plain";
+
+	# This directory must be the same as in /etc/letsencrypt/cli.ini
+	# as "webroot-path" parameter. Also don't forget to set "authenticator" parameter
+	# there to "webroot".
+	# Do NOT use alias, use root! Target directory is located here:
+	# /var/www/common/letsencrypt/.well-known/acme-challenge/
+	root /data/letsencrypt-acme-challenge;
+}
+
+# Hide /acme-challenge subdirectory and return 404 on all requests.
+# It is somewhat more secure than letting Nginx return 403.
+# Ending slash is important!
+location = /.well-known/acme-challenge/ {
+	return 404;
+}