I'm hoping someone can help me figure out a networking issue that has me completely stumped.

Setup

• Ubuntu 24.04 on a DigitalOcean droplet
• Nginx + Let's Encrypt
• React frontend
• Node.js backend
• Domain: morecreator.app

What's happening

My iPhone can access the site perfectly on:

• Home Wi-Fi
• Cellular

However, two completely different Windows laptops both fail.

The browser eventually returns:

ERR_CONNECTION_TIMED_OUT

curl also times out:

curl.exe -vk https://morecreator.app

Trying <server IP>:443...
Timed out

What I've already verified

• Nginx is running.
• HTTPS is configured correctly with Let's Encrypt.
• The site responds correctly when accessed locally on the server.
• UFW allows ports 80 and 443.
• DNS resolves correctly.
• No proxy configured.
• Reset Winsock and TCP/IP.
• Disabled Internet Connection Sharing (ICS).
• Tried different DNS servers.
• Disabled IPv6.
• No VPN installed.
• Windows Defender only (no third-party antivirus).
• Same behavior on two different Windows laptops.

The strange part

Everything worked perfectly a couple of weeks ago while I was in California.

After returning home to Georgia:

• ✅ iPhone still works
• ❌ Windows laptops both time out

The server configuration hasn't changed.

I'm trying to determine whether this is:

• a Windows networking issue,
• something with my ISP/router,
• DigitalOcean routing,
• or something I'm overlooking.

Has anyone run into something similar?

As in the title, I have NPM setup in my homelab, and it works great for the various docker containers I forward too. However, I want to actually see all the network communication going between the various services, both for troubleshooting an issue and just for learning. Currently, I've setup a man-in-the-middle proxy using its own self-signed certs to capture the traffic. It works just fine when I configure my browser to forward to it, but now I want to have NPM just forward everything to it so I can see all the communication. If there isn't an easy global setting I can configure to just have everything sent to the proxy, how can I configure the individual hosts?

Or is all this a feat in futility, and I'm just waiting my time? Thank you