As far as I understood, from the SRX:
- you can ping the server : ping 192.168.1.225
- you cannot telnet to the server: telnet 192.168.1.225 port 1723
Is the service really running on port 1723 on the server? Can you run netstat -ln and see the port 1723 open on the server?
Are you confident that there is no firewall on the server?