[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Help](/c/help/9) # Invalid configuration for subdomain 50 views · 0 likes · 4 posts Uos Libraries (@uos-libraries) · 2025-11-05 Hello, Im trying to get the following subdomain to work but it always shows “Invalid Configuration”, here is the case I have assined the subdomain catalog.sharjah.ac.ae to a project, and I have asked the IT Dept. in my institution to add the CNAM mentioned to our DNS provider, its been almost 2 hours, still not working here is the NSLOOKUP result: nslookup catalog.sharjah.ac.ae Server: ns01.sharjah.uos.edu Address: 192.168.12.51 Name: 722a9e311d663964.vercel-dns-017.com Addresses: 216.198.79.1 64.29.17.1 Aliases: catalog.sharjah.ac.ae  could you please help system (@system) · 2025-11-05 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. Pauline P. Narvas (@pawlean) · 2025-11-14 Hi, @uos-libraries! Welcome to the Vercel Community. Thank you for your patience :folded_hands: I tried to look up the domain **catalog.sharjah.ac.ae**, but couldn't find it. I got the error **NXDOMAIN** means: *“Non-existent domain.”* Could you share more about your set-up? Pauline P. Narvas (@pawlean) · 2026-01-20 Hi @uos-libraries, just following up to see if you've had a chance to check on the subdomain setup for catalog.sharjah.ac.ae or if you still need assistance with the "Invalid Configuration" issue. Let me know how it's going!
