Android AWS Cognito: unable to resolve host

Question

I am having difficulty getting Cognito registration and login to work for my app in Android Studio using this sample . When I attempt to log in via the simulator, the app works for a few seconds, then displays an error message: "Unable to execute HTTP request: Unable to resolve host 'cognito-idp.us-east-1.amazonaws.com': No address associated with hostname". This same error is the only error that appears in the console. I have seen similar questions and tried solutions such as checking to ensure my app has the permissions android.permission.INTERNET and android.permission.ACCESS_NETWORK_STATE , but the error persists. It also doesn't seem to be a network issue. I have updated to the latest version of the Android SDK as well as the AWS SDK, and the problem persists.

I currently I have a Cognito user pool set up which works properly for login on the iOS version of my app. Following the instructions in the readme for the sample code, I added an app to my existing user pool, and then copied and pasted the newly generated app client ID and app client secret into AppHelper.java for clientId and clientSecret respectively. I also set userPoolId to the ID listed for my user pool under "pool details" in the Cognito conosle, and cognitoRegion to US East, since this is the region of my user pool. I noticed that there was no need for me to set the pool name, as there was in the iOS version, so I'm wondering if that's something I need to do.

Sorry if this counts as a duplicate, but I wanted to post a question with the exact error message I encountered and the steps I took, and I'm wondering if someone has managed to get this specific sample working and what I should do.

Answer 1

The problem has been resolved, but unfortunately I'm not quite sure what fixed it since I didn't change anything in the code. All I did was install an update, so anyone with a similar problem should probably ensure that all SDKs used in the sample are properly updated, along with the simulator. It's also worth noting that I was using a different network than in my previous tests, so it's possible that it was a network issue after all.

Answer 2

I had the same issue.

The issue occurred when I used a VPN with emulator to test my program. The reason was that the internet connection in the emulator was too slow when connecting through a VPN.

This could also happen if your internet connection is not strong enough.

The solution is, use a real android device to test your code, if your internet connection is not good enough.

More info: https://github.com/aws-amplify/aws-sdk-android/issues/567