After your account has been created you will be given a username and a temporary password to login to the system. There are two methods of logging into the system: SSH and SCP.

Off-Campus Access: The ACG systems are visible from within the UMS networking system, but otherwise, they are firewalled from outside traffic. In the past, when someone wanted to access the cluster from outside, they would email their external IP to us and we’d add it in. Now though, there is a better way.

The University of Maine System now has a VPN service that is available to anyone with a email account. Once connected to this VPN, you can connect to the ACG login nodes and CIFS servers. The URL for the VPN setup is:

To install the VPN software, click on the Software button and then click on either the Viscosity for Mac button or the Viscosity for Windows button, depending on what type of machine you have. This will download the Viscosity software installer. Run the installer to install Viscosity.

Next, to create, download and load your profile, click on the Device button and then:

  1. click on the Add Device button, to start setting up a profile.
  2. Enter some descriptive information in the Description field.
  3. Click the Add Device button to create the profile.
  4. Click on the Download button to download the profile.
  5. Double-click on the file that just was downloaded

This will load your profile into Viscosity. In order to connect to the VPN, Run Viscosity and then click on your profile. It should connect to the VPN and then you will be able to login to Katahdin via SSH.

SSH: terminal access

Linux, Mac and other (non-Windows)

users should have an ssh client already installed. Just run the following command in a terminal:


where “username” is the username that will be provided to you.


users are recommended to install the PuTTY program and run it in SSH mode using the same address above to connect.

First login: Changing your password

The first time that you log into your account you will immediately be prompted to change your password.  You will be asked for your original password again and then you will need to enter in a new password twice. After this you will be logged out. You will then be able to log into the system with your new password.

File Transfer: getting files to/from your cluster account

There are two ways to transfer data to/from your account on the cluster:
1. SCP: Secure Copy
On a Mac you can use Cyberduck or the command line (scp command). On Windows Filezilla (specify port 22 to use scp) and WinSCP are used a lot. On Linux generally the command line scp command.
Examples of using the command line are:

scp -p file_name

or for a full directory tree:

scp -pr dir_name

First time use warning: if you have a new account and you have not used SSH to login yet you will not be able to use SCP to copy files to the system. This is because the first time you login to the system it will require you to change your password and you cannot do this with an SCP client.

2. CIFS Share: 

If you would like to be able to mount your home directory to a local share, like a Mapped Drive in Windows, via CIFS then please send an email to In the future this will be set up automatically.


See also How to Connect by VNC to your HPC Account

Running a Program

Compiling Code

Marconi Cluster support and user account support contact Steve Cousins

If you find that there is information missing or would like to see added please contact Ami Gaspar