I have planned to configure PostgreSQL 9.2.4 database Master and Slave replication on Redhat Linux Server 6.As per the documentation i have done the settings on both Master and Slave.I choose 7 simple step binary replication method as per the PostgreSQL website.After DB Synchronization command I start the slave and master as per the documentation.After that I am not able to login as postgres user on slave and not able to change the password of the user postgres.Kindly help me to done the same .