Problem following instructions installing Mattermost 2.2.0 in Ubuntu 14.04 + connecting 3 ubuntu machines

Hello @crspeller and @it33
Thanks for making Mattermost!

• The Mattermost DB setup correctly
• Nginx is setup correctly (nginx page come out, etc)
  One problem left, it seems connecting the 3 machines gives out error

Here's the prompt after ./platform

2016/04/29 03:31:07 EDT] [INFO] Current version is 2.2.0 (6671/Fri Apr 15 18:40:19 UTC 2016/8e883ad2f516820942cc0131241268c1ea909ff3)
[2016/04/29 03:31:07 EDT] [INFO] Enterprise Enabled: false
[2016/04/29 03:31:07 EDT] [INFO] Current working directory is /opt/timmyterpinter/mattermost/mattermost/bin
[2016/04/29 03:31:07 EDT] [INFO] Loaded config file from /opt/timmyterpinter/mattermost/mattermost/config/config.json
[2016/04/29 03:31:07 EDT] [INFO] Server is initializing...
[2016/04/29 03:31:07 EDT] [INFO] Pinging sql master database
[2016/04/29 03:31:07 EDT] [CRIT] Failed to ping db err:dial tcp 188.166.253.88:5432: getsockopt: connection refused
panic: Failed to open sql connection dial tcp 188.166.253.88:5432: getsockopt: connection refused

goroutine 1 0x6, 0xc820327f30, 0x8, 0xc8200ea310, 0x68, 0xa, 0xa, 0xc8200e8500, 0xc81ffec76f)
/go/src/github.com/mattermost/platform/store/sql_store.go:169 +0x894
github.com/mattermost/platform/store.NewSqlStore(0x0, 0x0)
/go/src/github.com/mattermost/platform/store/sql_store.go:61 +0x11c
github.com/mattermost/platform/api.NewServer()
/go/src/github.com/mattermost/platform/api/server.go:35 +0xe8
main.main()
/go/src/github.com/mattermost/platform/mattermost.go:67 +0x74d

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:1721 +0x1

goroutine 20 /usr/local/go/src/os/signal/signal_unix.go:22 +0x18
created by os/signal.init.1
/usr/local/go/src/os/signal/signal_unix.go:28 +0x37

goroutine 199 /usr/local/go/src/database/sql/sql.go:634 +0x45
created by database/sql.Open
/usr/local/go/src/database/sql/sql.go:481 +0x336

goroutine 197 0x7f1652d5c1c0, 0xc82006c008)
/go/src/github.com/mattermost/platform/Godeps/_workspace/src/github.com/alecthomas/log4go/termlog.go:33 +0x69
created by github.com/alecthomas/log4go.NewConsoleLogWriter
/go/src/github.com/mattermost/platform/Godeps/_workspace/src/github.com/alecthomas/log4go/termlog.go:26 +0xb5

goroutine 198 /go/src/github.com/mattermost/platform/Godeps/_workspace/src/github.com/alecthomas/log4go/filelog.go:87 +0xabc
created by github.com/alecthomas/log4go.NewFileLogWriter
/go/src/github.com/mattermost/platform/Godeps/_workspace/src/github.com/alecthomas/log4go/filelog.go:119 +0x38b
root@Mattermost-Server:/opt/timmyterpinter/mattermost/mattermost/bin#