Can't connect to Database connection pool server from application server

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We are using confluence Data Center edition now. Using database connection pool for PostgreSQL, named pgBouncer. It's running on a dedicated server.

• Node1: confluence Data Center Application server
• Node2: PostgreSQL connection pool - pgBouncer server
• Node3: PostgreSQL Server

On Node2

The configuration for pbBouncer is:

pgbouncer.ini

[databases]
confluence = host=[Node3 IP] port=5432 dbname=confluence

[pgbouncer]
listen_port = 6432
listen_addr = 127.0.0.1, ::1
auth_type = md5
auth_file = userlist.txt
logfile = pgbouncer.log
pidfile = pgbouncer.pid
admin_users = someuser

userlist.txt

"someuser" "somepassword"

It can be connected on the server itself:

psql -p 6432 -h localhost -U postgres confluence

On Node1

{confluence_HOME}/confluence.cfg.xml

<property name="hibernate.connection.password">somepassword</property>
<property name="hibernate.connection.url">jdbc:postgresql://[Node2 IP]:6432/confluence</property>
<property name="hibernate.connection.username">someuser</property>

Can't connect to Node2's pgbouncer server. So can't connect to database. Both netstat checking on Node2 and telnet checking on Node1, and iptables checking didn't find any problem.
If connect to Node3 directly, it will work.

Is it something JDBC's issue? Or what's reason for that?