Please use the alternative methods detailed on the remote access page.
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VPNs require specific software to be installed and then configured. This process can be difficult across a range of devices, particular on non-college-owned systems. VPNs are often blocked, intentionally or accidentally, by networks.
VPNs may be rate-limited and therefore suffer from an unreliable or poor performing connection. Examples include BBC iPlayer or Netflix, or other traffic which is legitimate at home, but not permitted. This has been problematic in the past, as ICT have to address these violations of the AUP, even though the user did not intend this.
In some countries, VPNs are not legal. By relying on the use of VPN for our services, we either exclude or place customers in these locations at risk. If you like creating your HTML pages interactively by editing them 'in situ' via a ssh session into a Maths Linux system, the editor will by default save your pages with the correct permissions as in this example: But if you have set unusual permissions for your files on your own system, or if you are using a Windows, a Mac or a third-party Linux sftp or scp program that allows permissions to be changed during the upload so that read access by the webserver is denied, your pages won't display!
Pages, images, scripts and any other files you want to be able to display to visitors to your home pages should be set to: In this case the best way to get the permissions right is to first log into a Maths Linux system, say, hessian. This means that: Do note that a folder that lacks a default index page can still serve a page or file explicitly referred to by the URL, as in the example here: Getting your home page content onto the webserver Although you cannot log into or transfer files directly to the webserver or the ICNFS server, there are several ways in which you can get your pages, images, sound files, etc into your home pages: Using file transfer methods, two options are supported: Secure File Transfer Client.
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You can also drop down into a shell terminal and run sftp from the command line as this is part of the native ssh installation in the UNIX operating system that underlies Mac OS X. A list of the systems that are currently accessible externally is kept here. Here is an example of a command line sftp login from a PC running OpenSolaris to hessian, which is one of the Maths SSH gateways - note the short-form addressing where the host is simply referred to as 'hessian' since the connection is being made from a computer on the same sub-domain ma.
A simple example of the syntax for using scp on a Linux systems is given here - the file gprs-network-info. This is because anything after the 'nfs' in the line shown above is optional and your existing entries may not have these, or they may have different options.
Image creation and editing is possible using The Gimp , an alternative to Photoshop that handles many image formats and contains a lot of tools for both artists and photo-retouchers. Also installed is the ImageMagick suite, a collection of powerful command line utilities that allow ypu to perform all sorts of format conversion, resizing, image conversion, special effects, colour editing, etc.
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Although you can run these programs from the command line during an interactive login session, the main reason this suite is installed is so that you can actually run these programs from a web script written in Perl or PHP so that you can do a lot of exciting and adventurous things with images in real-time. This assumes that your local system is configured correctly to allow remote X-Windows clients to execute displays on your local system, and that you have configured your ssh client to allow X forwarding, etc.
Troubleshooting X-Window System problems is beyond the scope of this page so if display doesn't work for you, have a look at the SSH pages.