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Don't forget that PPTP uses not only TCP protocol but also GRE.
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Don't forget that PPTP uses not only TCP protocol but also GRE.

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Our PPTP connection from inside network to our customer environment fails. What could be problem. We all ready checked that our firewall allow any traffic to the customer. Customer says that their end is ok. Many other takes connection there by PPTP.<br />
<br />
-&gt;Set up a new connection or network<br />
-&gt;Connect to a work place<br />
-&gt;User my Internet connection (VPN)<br />
-&gt; Internet address: 111.111.111.111<br />
-&gt; Destination name: TheName<br />
-&gt; Next<br />
-&gt;User name: xxxxxxx<br />
-&gt;password: ********<br />
-&gt;Domain: (left empty)<br />
-&gt;Connect<br />
<br />
Connecting...<br />
Veryfying user name and password...<br />
<br />
Connection failed with error 619.<br />
<br />
A connection to the remote computer could not be established, so the port used for this connection was closed.<br />

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Our PPTP connection from inside network to our customer environment fails. What could be problem. We all ready checked that our firewall allow any traffic to the customer. Customer says that their end is ok. Many other takes connection there by PPTP.

->Set up a new connection or network
->Connect to a work place
->User my Internet connection (VPN)
-> Internet address: 111.111.111.111
-> Destination name: TheName
-> Next
->User name: xxxxxxx
->password: ********
->Domain: (left empty)
->Connect

Connecting...
Veryfying user name and password...

Connection failed with error 619.

A connection to the remote computer could not be established, so the port used for this connection was closed.


Error 619 using PPTP in Window 7

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.

Windows 7

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.