If we use for OpenVPN, say TCP port 443, we can scan with nmap, for example, and receive a result because we are just starting the TCP three-way handshake(with "-sS" scan we will not even complete it). How to securely publish an FTP Server running on Windows Server 2008 R2 with ISA Server 2006. Figure 1: FTPS Protocol rule nameEnter the IP address of the FTP Server you want to publish. Because ISA Server 2006 has no built-in protocol definition for the required FTPS protocol, we have to manually create the protocol definition. Click New to create the required protocol definition and give the new protocol definition a name. The protocol type is FTP, the direction is Inbound and the port definition is from 21 to 21. As a second protocol range enter the same IP range for the port range specified in the Firewall properties of the FTP Server configuration.
Specify the Listener for the network on which ISA Server 2006 should listen for FTP traffic. Important:The FTP-Filter does not have to be enabled for the new FTPS protocol definition so you have to make sure that the option is unchecked in the protocol definition.
After we have finished all settings on ISA Server site, it is now time to configure the FTP Server part for the Firewall configuration.
I already assume that you have configured the required parts of the FTP Server two use the FTPS protocol.
Windows Server 2008 R2 comes with the correct FTP Server version which is built into the Windows Server 2008 R2 Server Manager Roles configuration as you can see in the following screenshot.

Because we want to use FTPS (FTP over SSL) on our FTP Server, we have to specify the port range for the FTP Data channel. Now you should be able to connect from the Internet to your internal FTPS server through ISA Server 2006 with your favorite FTP client application which supports FTP over SSL (FTPS). In this article, I tried to show you how to securely publish an FTP Server running on Windows Server 2008 with ISA Server 2006.
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TechGenix Ltd is an online media company which sets the standard for providing free high quality technical content to IT professionals. And it does not provide per-packet data integrity(proof that the data was not modified in transit), per-packet data origin authentication(proof that the data was sent by the legitimate source) or protection against replay attacks. The result is that packets without the correct signature can be dropped immediately upon reception, before they have a chance to consume additional system resources such as by initiating a TLS handshake". Start the ISA Server 2006 MMC, navigate to the Firewall policy node and create a new Server publishing rule. We need a protocol defintion for the standard FTP protocol port and a port range for the FTP connection which must be the same port range configured at the Firewall protocol support setting on the FTP Server. For more information how to configure FTPS on the FTP Server I give you a link at the end of this article. The port range you enter here must be identical with your protocol definition at ISA Server site. If your connection is unsuccessful first double check the FTP client connection settings with the FTP configuration in IIS and if a secure FTP connection is still not possible, you should have a look in the ISA Server 2006 real time monitoring to see if something gets blocked.

ISA Server 2006 has built-in capabilities to publish a FTP Server but per default no wizards for publishing the more secure FTPS protocol. His efforts have earned him recognition as a Microsoft MVP for ISA Server since 2004 until 2014. Individual focus sessions are scheduled to run consecutively, allowing you to attend all sessions, or selectively choose only those you wish to attend. Note that installing OpenVPN on ISA is not recommended or supported, OpenVPN is not a third-party add-n for ISA, so you can run into both security and functionality issues.
FTP is a very unsecure protocol which transfers data without encryption so it might be dangerous to use this protocol. If there are more than one IP addresses bound to the External network interface, you have to explicitly enter the IP address on which ISA Server should listen for traffic. You must also specify the external IP address of the Firewall which is typically the IP address from the Firewall which is directly connected to the Internet. To publish a Microsoft FTPS-Server you have to configure some additional settings on the Windows Server 2008 and some settings at ISA Server 2006 site.
A better way is to use the FTPS (FTP over SSL) protocol which provides protocol encryption for transferred data. Configuring ISA Server 2006 for FTP publishing is a little bit more complicated because you have to manually create a protocol definition for FTPS and the port range used for the FTPS connection.

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