Once again, the details on how to do this step will vary depending on your specific registrar or DNS service provider, but the next step is to ensure that your domain (YOURDOMAIN.com) and any desired subdomains (www.YOURDOMAIN.com, blog.YOURDOMAIN.com, etc) are pointed to your external IP address. If you have a static IP address from your ISP, that’s great! But chances are you don’t, so you’ll need to set up a Dynamic DNS updater as well. Fortunately, your Synology NAS can do this for you! 

I’ll explain how to set this up with noip.com (dynamic DNS service), but if you’re using a different provider, you’ll need to do a little research on your own about how to configure things.

Two of my domains are through noip.com – I use the Groups feature to update 10 hostnames simultaneously. You can find instructions about how to set this up on noip.com but basically you just do this:

1. Login to noip.com, and click on the Groups tab under Dynamic DNS, on the left. 

2. Click the Add Group button, give your group a name and a password, and then choose whatever hostnames (domains and/or subdomains) you’ve set up. 

3. Go into DSM and open the Control Panel. Under External Access, select DDNS at the top. Click Add, and select your service provider from the list (in this case, No-IP.com). Add a hostname (choose one of your hostnames, I don’t think it matters which – e.g., YOURDOMAIN.com or YOURDOMAIN2.com or whatever). For username, enter:

yourgroupname%3Ayourusername

The “%3A” in between your group name and user name is actually a “:” but noip.com says you need to type it this way. So enter yourgroupname%3Ayourusername in the Username/Email field, and then input the group password you chose in step 2, above. Leave the External Address field set to Auto. Click Test Connection and it should come up as Normal. If it does, you’re good to go. Click OK to save the DDNS configuration. From now on, if your external (public) IP address ever changes, your Synology will automatically update noip.com (all of the hostnames you set in 4b, above) with the new public IP address. Very cool!

Once that’s done, you can proceed to step 4 – setting up SSL for all of your sites.