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I'm trying to open port 1723 for PPTP in Computer Protection. Can't seem to get it to work. I'm not sure if I'm doing it correctly or missing something.
According to https://blogs.technet.microsoft.com/rrasblog/2007/06/13/ports-affecting-the-vpn-connectivity/, you also need to allow IP Protocol number 47 (GRE) for transport of data. TCP in PPTP is used only to establish the connection.
I had port 1723 and protocol 47 open already. For some reason, it wasn't applying the changes to the workstations. I had to switch profiles back and forth for the changes apply. Thanks for the help!