no pg_hba.conf entry for replication connection from host

I have been configuring a slave server that needs to connect to the host.
Both the master and the standby servers have a pg_hba.conf that looks like
this:

# Allow anyone to connect remotely so long as they have a valid
username and
# password.
host replication ${REP_USER} 0.0.0.0/0 md5
host ${DB_NAME} ${DB_USER} 0.0.0.0/0 md5

This should allow access from every IP address, right? Evidently, though,
the standby server cannot connect using the REP_USER credentials via
`primary_conninfo`

primary_conninfo = 'host=${MASTER_PORT_5432_TCP_ADDR} port=5432
user=${REP_USER} password=${REP_PASS}'

I know this doesn't work because I never see in my logs:

LOG: streaming replication successfully connected to primary

Instead, what I see is

LOG: database system was interrupted; last known up at 2015-04-09
16:35:05 GMT
LOG: entering standby mode
LOG: redo starts at 0/E000028
LOG: consistent recovery state reached at 0/E0000F0

What am I doing wrong?

--
*Volkan Unsal*
*web and mobile development*
volkanunsal.com <http://bit.ly/1h1ebjy>