VPN error 619 is almost always a problem with a firewall on the client machine or the firewall the client is behind breaking PPTP.

To enable VPN tunnels between individual host computers or entire networks that have a firewall between them, you must open the following ports:

• To allow PPTP tunnel maintenance traffic, open TCP 1723
• To allow PPTP tunneled data to pass through router, open Protocol ID 47

For specific instructions on how to enable a protocol or to open a port in firewall please make sure you check the help pages of your antivirus or router.