Websites won't load after enabling ipv6 on droplet running Centos 8

I followed the instructions for enabling ipv6 on an existing droplet (Centos 8). Now all of my websites return a “connection timed out” error.

I’m running Centos 8 and I’m using the DigitalOcean Cloud Firewall. Both HTTP and HTTPS are open for inbound traffic over ipv4 and ipv6. Apache is set to Listen 80 and Listen 443.

I can still connect via SSH, so that’s still working. Pinging the Google ipv6 nameserver works ping6 2001:4860:4860::8888. Running sudo systemctl restart NetworkManager.service returned no errors. Rebooting and restarting the httpd service didn’t help…

I’m pretty much out of ideas. What else could be causing this?

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