pgpool authentication with pgpool failed for user

I created pool_hba.conf and pool_passwd to enable md5 authentication through pgpool-II but it does not
work. Why?

Probably you made mistake somewhere. For your help here is a table which describes error patterns depending on the setting of pg_hba.conf, pool_hba.conf and pool_passwd.

pg_hba.conf	pool_hba.conf	pool_passwd	result
md5	md5	yes	md5 auth
md5	md5	no	"MD5" authentication with pgpool failed for user "XX"
md5	trust	yes/no	MD5 authentication is unsupported in replication, master-slave and parallel mode
trust	md5	yes	no auth
trust	md5	no	"MD5" authentication with pgpool failed for user "XX"
trust	trust	yes/no	no auth