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# The required http-01 challenge failed

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HGuaymas (@hguaymas) · 2026-01-09

My subdomain works with http but not with https.

I’m getting the following error message:

![image|690x86](upload://vlGgCpEF0VrE0Q3ndqNLNRezvGN.png)


system (@system) · 2026-01-09

The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for [bonus points](https://community.vercel.com/t/introducing-the-vercel-leaderboard/1358).

https://vercel.com/docs/projects/domains/troubleshooting

You can also use [v0](https://v0.dev/) to narrow down the possibilities.