If you use a personal firewall or a broadband router, or if there are routers or firewalls between the VPN client and the VPN server, the following ports and protocol must be enabled for PPTP on all firewalls and routers that are between the VPN client and the VPN server:
Client ports: 1024-65535/TCP
Server port: 1723/TCP
Protocol: PPTP
Additionally, you must enable IP PROTOCOL 47 (GRE).
or you are using router that has outdated firmware (that is dated 2000 or earlier).
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Alaatec
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