CD

Cloudflare Developers•5mo ago

manidev

Custom hostname not mapping to worker

Hi

I’m running into a Custom Domain issue with Workers.

I have a Worker (pages-lp) that dynamically serves landing pages for user-created subdomains. I’m using Cloudflare Custom Hostnames / Custom Domains for this.

My main domain is pages.io

A Worker is mapped to lp.pages.io

I’ve set up dynamic user domains via the Workers Domains API (example: mani.customer.com)

cname for mani.customer.com is configured to lp.pages.io and proxied through Cloudflare

The Worker checks KV_DOMAINS for the mapped domain and serves HTML accordingly

When I visit mani.customer.com, I consistently get a 522 Connection Timed Out error.

The Worker isn’t even hit (no logs in Observability)

The same Worker works fine when I add mani.customer.com directly as a route in wrangler.toml

My question:

Do I need a specific setting or plan to make dynamic custom domains work under Cloudflare for SaaS?

Also, do I need to disable DNSSEC or change anything in DNS to make the proxy connection succeed?

Is there a way to handle unlimited dynamic custom hostnames without having to predefine them in wrangler.toml routes?

Any insights or similar experiences would be super helpful

Thanks in advance!