@rajanprabu After changing password it worked

@kkt237 Hardcoding the public ip works.
String clientPublicIP = "10.21.13.45";
A temporary workaround for the moment

Same error
sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
Parameter specified as non-null is null: method okhttp3.OkHttpClient.newCall, parameter request
params.put("clientcode", clientCode);
params.put("password", password);

As of now, clientcode and password are sent in request.
What other parameter is required ?