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RemoteAccess

1.  Why is ftp, telnet, and rlogin disabled?

The cleartext protocols (FTP, telnet, rlogin, rsh, rcp, and rexec) into all ECE/CIS networks, except anonymous ftp to ftp.udel.edu, has been turned off. You now need to use ssh. Use sftp as a replacement for ftp, which is available from several ssh clients. For more info see UseSSH for more info.

2.  Using SSH

All ECE/CIS Solaris and Linux systems have SSH clients and servers installed. The client programs include ssh, scp, slogin, and sftp. For Windows users the University has a licensed version available on UDeploy, or you may use a free version if you wish.

3.  SSH access policy

The following computers are available from off campus: (Up to date machine hardware configuration can always be found here )

Note: ren.eecis.udel.edu and hoek.eecis.udel.edu each load balance between two servers (ren1.eecis, ren2.eecis and hoek1.eecis, hoek2.eecis). The ren and hoek names (without the numbers) should be used for access. stimpy.eecis.udel.edu load balances to mudskipper and mudskipper2 (a SunFire V880 with 6 Ultrasparc III processors).

The preferred remote access systems are ren.eecis.udel.edu, and stimpy.eecis.udel.edu (research) and orioles.acad.ece.udel.edu (acad). These servers allow ssh access from any system in the world. Other ECE/CIS administered networks (Solaris and Linux) allow ssh connections from systems on campus networks (including ppp) and from Comcast and Verizon (the most used ISPs by users). Connections from other networks are blocked. Connections to networks and hosts not administered by ECE/CIS only (Windows PCs, other self-admined OSes) are not blocked.

4.  Can not log onto mail server (eecis.udel.edu)

The mail servers do not allow users to log onto them with ssh or sftp. All access to the mail servers must be through an IMAP client or webmail.

Note that the server mail.eecis.udel.edu is also known as louie, ee.udel.edu, cis.udel.edu, eecis.udel.edu, ece.udel.edu.

5.  Graphical remote access to Unix/Solaris machines

In order to open graphical user interfaces in your desktop from servers such as ren or stimpy, you have to use an X Server (This is an application that allows you to display remote programs on your desktop computer). Such programs include Exceed or the X-server of cygwin (Cygwin is a free unix emulator for Windows based computers).

5.1  Starting the CYGWIN X-Server

The X11 package is not a default install of cygwin, therefore, if you installed the default application, you'll need to run the setup again and install the application. Once the package is installed, the installer places a script that starts the X-Server for you and displays a graphical terminal on your screen. That script startxwin.bat is normally located at:

<CYGWIN_home_directory>\usr\X11R6\bin

You can copy it or create a shortcut to it on your desktop of you don't want to look for it every time.

5.2  Displaying Remote Applications on the X-server of a Windows computer

Once you have an X-server running you want to tell the server you are connecting to that you want to forward the graphical interface to your desktop. This is informed when you are establishing the connection to the server.

If you use the University software SSH Secure Shell:

Open a SSH Secure Shell window, and go to Settings under the Edit menu. In the Profile Settings tree, find the Tunneling option. Make sure the box "Tunnel X11 Connections" is marked.

If you like to use the ssh command of cygwin use the flag -X:

ssh -X username@machine.domain.udel.edu (i.e. ssh -X mrsmith@stimpy.ee.udel.edu).

It will prompt for the user's password and then give you a command line, where you can run the application.

6.  Remote Load Balancing

There are remote load balancing host aliases for three of the acad labs. To use them just ssh to the host alias for the lab that you want to log into. The host aliases are:

The load balancing script will log you into the host that has the lowest load.

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