Input Java administrator user credentials step Fails

HI All,

We are upgrading PI System from 7.0 to 7.31, where we are facing an issue in Configuration phase as below

An error has occurred during the execution of the Input Java administrator user credentials step.

Could not display dialog UserPasswords. Could not execute dialog UserPasswords. See previous messages. SDM connection error when try to connect to SDM server on host xxxx listening on port 50018. com.sap.sdm.apiimpl.remote.client.APIRemoteExceptionImpl: Server XXX did not accept login request as XXX on port 50018 - Connection between SDM client and server is broken

KIndly help!!

We have already maintained the admin credentials in secure store - configtool.

Thanks,

Preetha Balan