# Custom domains

- [My custom subdomain isn't working](/url/gitbook.com/docs/help-center/published-documentation/custom-domains/my-custom-subdomain-isnt-working.md): A quick guide on how to troubleshoot dns issues in GitBook
- [Change or update my custom domain in GitBook](/url/gitbook.com/docs/help-center/published-documentation/custom-domains/change-or-update-my-custom-domain-in-gitbook.md): This is a quick guide on how to change or update your custom domain in GitBook
- [How can I solve the "path is already taken" error?](/url/gitbook.com/docs/help-center/published-documentation/custom-domains/how-can-i-solve-the-path-is-already-taken-error.md)
- [How can I change the slug in the URL?](/url/gitbook.com/docs/help-center/published-documentation/custom-domains/how-can-i-change-the-slug-in-the-url.md)