PPTP client can't reach external server

Hello i've a device at home that need to be connected with a pptp vpn to the office server.
I tried opening the port(47 & 1723) under port forwards but i still can't connect.
Thanks in advice for the support.

GRE is protocol 47 not port 47. (Other protocols are for example UDP and TCP. ) GRE itself doesn't use ports.


Thanks now it's working fine i left only the 1723 port in the port forward.
And allowed gre with this post [Solved] Ar71xx Kernel 4.9 PPTP Passthrough not working (TL-WR942N v1)

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