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yourdomaincom on port 5999 You also need to start Stunnel on your client system With Stunnel and VNC running on the server system, and Stunnel running on the client system, you can now try to connect to the server system securely using VNC over Stunnel Enter the following: kitten# vncviewer localhost:1 On the sample client system, kitten, you launch the vncviewer binary and request a connection to localhost:1, which means Display #1 on the local system This display equates to the port 5901, which Stunnel is listening on and forwarding to port 5999 on the puppyyourdomaincom system From there the Stunnel daemon forwards the connection to port 5901 on puppy where the VNC server is waiting for connections You will be prompted for a password, and then, if authenticated, you will then be connected to the puppy system via VNC.

Web development can sometimes be pretty repetitive. No, I am not talking about creating a lengthy online questionnaire that no sane person will ever fill out, but rather in terms of the markup you have to write. To ease this pain, Microsoft has introduced a number of prewritten HTML and ASP.NET snippets (blocks of code) that will substantially reduce the amount of typing you have to do and minimize typos (and possibly reduce RSI in the web development community). I am a big believer in saving time spent on tedious tasks, so let s take a look into these snippets now.

You could also update this configuration as I will do with the syslog-ng secure connection demonstrated in 5 This allows connections from specific systems and from systems with valid certificates when you use the verify option in your stunnelconf configuration file..

IPSec is short for IP security and represents a collection of extension standards and protocols for the original Internet protocol related to the secure exchange of IP packets It was first developed for IPv6 and then made backward compatible for IPv4 At the core of this collection of standards is RFC240112 A variety of products and tools use IPSec to secure connections between systems IPSec works at a lower level than the SSL/TLS protocols Whereas SSL operates between the network and application layers, IPSec encrypts traffic at the IP level and is capable of encapsulating the entire IP datagram (tunnel mode) or just the data portion of the IP datagram (transport mode) The tunnel mode allows the encapsulation of the entire original IP datagram with a new encrypted datagram While the transport mode encrypts only the payload of the IP datagram, leaving the IP header unencrypted.

With IPSec you could even layer a protocol like SSL/TLS over the top of a connection, further enhancing your security You will now look at the S/WAN13 implementation of IPSec S/WAN can be best described as a virtual private network (VPN) solution S/WAN stands for secure wide area network and was an initiative by RSA Security both to develop a standard for the use of IPSec to build VPNs and to promote the deployment of Internet-based VPNs using IPSec While S/WAN is no longer being actively developed, a number of open-source packages have developed out of the S/WAN project One example of this is Openswan Openswan is an open-source S/WAN IPSec implementation principally for Linux and other *nix operating systems (though it also supports Windows to some degree) It is available at http://wwwopenswanorg/.

Let s look at an example by following these steps. 1. 2. Create a new ASP.NET project. In Default.aspx, type textbox and then quickly press Tab. Visual Studio will insert the following code: <asp:TextBox runat="server" /> 3. 4. 5. But wait it gets better. Give your TextBox an ID of txtTest and press Enter to add a new line. Type requiredfieldvalidator and press tab. Visual Studio will then insert the markup below. Note how the ControlToValidate property was set to the nearest textbox automatically (if you add another textbox to the page you should still find this is the case), and how the cursor was focused on the ErrorMessage property . VS2010 will attempt to guess any properties it can (in this case due to the textbox s proximity), and intelligently set the focus on any other fields that need to be filled in. <asp:RequiredFieldValidator ErrorMessage="errormessage" ControlToValidate="txtTest" runat="server" /> 6. The focus is currently set to the ErrorMessage property, so change it to You must fill in this field and then press Tab to move the focus to the next field.