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Forum Discussion
redge9987
Jan 11, 2026Aspirant
PR60X Cloudflare DDNS
I am getting an "Authentication unsuccessful" for my Cloudflare DDNS. I have tested my api token so I know it works. I think it may be the username. I have tried my email address tied to the api toke...
- Jan 11, 2026
The "Authentication unsuccessful" error in router-based DDNS setups is frequently caused by the router using an outdated Global API Key protocol rather than the modern API Token standard. If your router requires a username and won't let you leave it blank, it is likely expecting your Cloudflare email address paired with your Global API Key (found under My Profile > API Tokens), rather than a scoped Bearer token. If you must use a scoped API Token and the router demands a username, try entering token or bearer as a placeholder, but be aware that many older router firmwares simply do not support the Authorization Header format required for new tokens and will only work with the Global Key.
redge9987
Jan 12, 2026Aspirant
Thanks c3po - I just checked and it works great!
FYI forget my earlier post. Instead of a Name Server, the router wants a subdomain. So for future visitors of this forum, the "Domain" field, do "home@example.com" or something of the like. Here is what I did for my A record in Cloudflare:
Type: A
Name: home
Content: current public IP
TTL: Auto
Proxy: OFF
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