Hi @gangadhar, welcome to the forum! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a real picture as your avatar because it helps build community!
- Did you obtain a domain name when setting up Central?
- What is set for the server settings in the Collect app?
- You might try to repeat the process to configure the app user.
- When installing Central did you follow the below line of the instructions?
- Type
nano .envand press Enter. This will launch a text editing application. Change theDOMAINline so that after the=is the domain name you registered. As an example:DOMAIN=MyOdkCollectionServer.com. Do not include anything likehttp://.
- Type