Why do my VPN connections work from some locations and not others?
1. The Internet service provider (ISP) that you are using at the time of the connection may be blocking specific types of TCP/IP traffic that are preventing VPN connectivity. For example, PPTP traffic uses TCP port 1723 to create the connection and IP protocol 47 to send data. L2TP/IPSec traffic uses UDP ports 500 and 4500 to create the connection and IP protocol 50 to send data.

Your VPN traffic may also be blocked by a NAT. For PPTP connections, ensure that the NAT has a PPTP editor that can properly map PPTP data traffic. For L2TP/IPSec connections, ensure that the NAT supports a single IPSec connection or that both the VPN client and server support IPSec NAT-T.

2. How do I configure my firewalls to allow Microsoft VPN traffic?
A. PPTP traffic uses TCP port 1723 to create and maintain the connection and IP protocol 47 to send data. L2TP/IPSec traffic uses UDP ports 500 and 4500 to create and maintain the connection and IP protocol 50 to send data. Configure your firewall to allow these types of traffic to and from your VPN server.

I have open this port : 1723, 500, 47, 1723(PPTP)

It’s working well. Done