So I have two instances of AdGuard Home running on two providers (Vultr and DigitalOcean in case it’s relevant) and I want to know how to make it more secure. I have the following firewall rules in place already:
- Port 22 open for all
- Port 53 open for select CIDRs (my IP and relatives’ IP for router level config, and for a couple of VPN IPs)
- Port 443 open for all
- Port 853 open for all
- Everything else closed for all
Despite this config, my AdGuard Home instances sometimes slow down and stop working. I’m on their 1 CPU, 1 GB RAM and SSD storage plans. What can I do to make the VPS more secure?
Change the SSH port.
For what do you need port 443 and 853?