diff --git a/lib/prerequisites.sh b/lib/prerequisites.sh
index 60fa945..f8b342a 100755
--- a/lib/prerequisites.sh
+++ b/lib/prerequisites.sh
@@ -46,7 +46,7 @@ source /etc/bridgehead/site.conf
 # TODO: Check all required variables here in a generic loop
 
 if [ -z "$SITE_NAME" ]; then
-  log ERROR "Please set site_name."
+  log ERROR "Please set SITE_NAME."
   exit 1
 fi
 
@@ -66,7 +66,7 @@ if [ ! -d "certs" ]; then
 fi
 
 if [ ! -e "certs/traefik.crt" ]; then
-  openssl req -x509 -newkey rsa:4096 -nodes -keyout certs/traefik.key -out certs/traefik.crt -days 365
+  openssl req -x509 -newkey rsa:4096 -nodes -keyout certs/traefik.key -out certs/traefik.crt -days 3650 -subj "/CN=$HOST"
 fi
 
 log INFO "Success - all prerequisites are met!"