Environment: Knox Configure (KC)

Scenario
- Sometimes system administrators encounter issues while uploading applications to Knox Configure (KC).
- The error occurs while uploading APK files with APK signature scheme V2 to KC:

Error is shown as below :
The application certificate is invalid.[4000203]
{"code":4000203,"message":"INVALID_APP_CERTIFICATE","data":"INVALID_APP_CERTIFICATE"}

Cause
- The APK Signature Scheme V2 does not generate the cert.rsa/cert.dsa file inside the META-INF folder.
- The application upload fails because KC searches for the cert.rsa/cert.dsa file to verify the APK but the file does not exist.

Resolution
This issue was resolved in the KCS 1.31 release on May 20th, 2020.

NOTE:
- If you continue to experience the 4000203 error while uploading applications to KC then you may submit a support ticket through your Knox dashboard.