doc: server configuration: add note on required firewall/NAT for Let's Encrypt certif...

diff --git a/doc/md/Server-configuration.md b/doc/md/Server-configuration.md
index 3c207acc4f258acd71176bce6069bcf8c5538005..f14be7f38b89e4ea449eaf10be1f22c95442e50d 100644 (file)
--- a/doc/md/Server-configuration.md
+++ b/doc/md/Server-configuration.md
@@ -77,7 +77,8 @@ sudo apt install certbot
 sudo systemctl stop apache2
 sudo systemctl stop nginx
 
-# generate initial certificates - Let's Encrypt ACME servers must be able to access your server!
+# generate initial certificates
+# Let's Encrypt ACME servers must be able to access your server! port forwarding and firewall must be properly configured
 sudo certbot certonly --standalone --noninteractive --agree-tos --email "admin@shaarli.mydomain.org" -d shaarli.mydomain.org
 # this will generate a private key and certificate at /etc/letsencrypt/live/shaarli.mydomain.org/{privkey,fullchain}.pem