Problem

-- getting this error when deploying a flow from Mapping Services to B2Bi

User null and supplied password cannot be authenticated to execute MapDeployer commands

com.axway.ms.deploy.core.ObjectDeployException: User null and supplied password cannot be authenticated to execute MapDeployer commands
java.lang.Exception: User null and supplied password cannot be authenticated to execute MapDeployer commands

-- user and password are correct

Resolution

* make sure that the B2Bi Client version matches the version of B2Bi server

for instance, if you are running on B2Bi Server is 2.6 SP2, the version of B2Bi Client must be 2.6 SP2 as well