VPN ERROR 619 :: A connection to the remote computer could not be established, so the port used for this connection was closed

I have been searching endlessly for this issue. Every time I try to connect to a VPN connection I get the error above. Thank you for any relevant input concerning this matter. My NIC is Qualcomm Atheros and I'm in Win8.1 x64.

everything normal before?
is there any changes before this issue happen?
turn off your antivirus and firewall, update the latest VPN client software, if still not working go to security settings and change the VPN type automatic to PPTP. And also change data encryption configuration to Optional and select CHAP & MS-CHAP v2.
If still not working try with other internet connection and try to contact your VPN provider

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    Meanwhile, I would like to share the following with you for your reference:
    Troubleshooting common VPN related errors
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    Hi，
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