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can not access all ports on the same LAN as instance

User_4INK5 Member Posts: 1 Green Ribbon

I have a Ubuntu 20.04 minimal instance (free tier) with a number of apps running in Docker containers including a wireguard (VPN) container. I added the necessary ingress ports in the instance's security list and can access all my desired apps from the Internet/WAN. But for some reason I can not access all the same ports internally/from the LAN while VPN'd in. Oddly, the only port/service I can access while VPN'd is port 22 (SSH).

Why would I be able to access ports/apps just fine from the WAN, but can not access them from the LAN? How do I resolve this?