|Configuring User Authentication / Creating Users for BUILTIN Authentication|
Built-in system users are defined when you boot the GemFire XD locator. Other GemFire XD members that join the system must specify one of the same system users that are defined in the locator. If you need to change the password of a system user, you must stop all members of the distributed system, and then restart them (starting with the locator), specifying the new username definition when you start.
To change the password of an existing system user, either specify a new password when your start a GemFire XD member using the gemfirexd.user.UserName system property, or generate a new encrypted password using gfxd encrypt-password and place the new encrypted password in the gemfirexd.properties file.