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Accessing Plesk through a Microsoft ISA Server
Enabling alternate External SSL Ports in Microsoft ISA Server versions 2000, 2003, 2004
If your network users are located behind a Microsoft ISA Server Firewall and Proxy Server, and cannot connect to unlimitedwebhosting.co.uk on port 8443 or port 8444, this is probably due to your ISA server not having the required secure tunneling ports enabled. There is no function to do this in the ISA Server Manager, nor in IIS, nor your browser connection settings. The following notes will help you to get these ports opened as authorised destinations on your ISA Server configuration.
In Microsoft Internet and Acceleration Server versions prior to ISA Server 2006, there is no native tool for enabling the server to provide access to external website URLs that specify SSL ports other than port 443. This is by Design according to Microsoft who state that clients behind an ISA Firewall and Proxy Server do not normally access alternative ports than 443 for secure browser traffic.
Several Microsoft web pages address this issue in ISA Server 2003 upwards, requiring instalation of Microsoft Visual Basic Runtime and extensive knowledge or programming scripts with this application. One such solution can be found at http://support.microsoft.com/kb/283284 For the average network manager, this solution is complex and fraught with possibility for error and server configuration error, however it remains Microsoft's official response to the problem.
An easier solution, much simpler and faster to implement, and which works immediately without trauma, can be found at http://www.isaserver.org/articles/2004tunnelportrange.html
This is a private website set up by Microsoft developers to plug gaps in Microsoft's support infrastructure. The referenced article displays two solutions, though it does not immediately make clear that they are for distinctly different versions of ISA server.
The first solution using the text-based command prompt is for ISA Server 2000 and ISA Server 2003
The second solution using the GUI tool is for ISA Server 2004 (it might work with later versions too - check documentation for guidance).
To open ports 8443 and 8444 for use with unlimitedwebhosting.co.uk's cloud hosting, server administrators need to perform the configuration changes specified in the isaserver.org article
For ISA Server 2000 & 2003, browse to http://www.isatools.org/tools/isa_tpr.js and save the screen text to a text file (using MS Notepad NOT Wordpad) called isa_tpr.js in the root of your C: drive. Launch and use the tool as described in the isaserver.org article.
For ISA Server 2004, download and save either http://www.isatools.org/tools/ISAtrpe.zip or http://www.isatools.org/tools/isasecport.zip to a folder on your hard drive and extract them, run the .msi or .exe file to install them (they will NOT work with ISA Server 2000 / 3) then call them from Windows Explorer and follow the instructions - they are intuitive.
It is important to note that by using these tools you do not need to make any changes or additions to ISA Server's access, protocol, or other rules. Using these port tools to open the alternative secure ports will enable clients (and the browser on the server computer) to retain original settings and access the secure control panel at https://cloud.unlimitedwebhosting.co.uk:8443 or your domain at the same protocol and port.
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