Introduction

From the outside world, the SCS network is not accessible because it is behind the ITS firewall and behind the SCS firewall. In order to log in to the SCS network, you can use the SCS external access host:

  • access.scs.carleton.ca

In order to use access you need to have an SCS Linux account

SSH Tips and Errors

Thursday, April 18, 2024

PuTTY SSH Client Found Vulnerable to Key Recovery Attack

In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker to recover a user's NIST P-521 secret key via a quick attack in approximately 60 signatures. This is especially important in a scenario where an adversary is able to read messages signed by PuTTY or Pageant. Besides impacting PuTTY, it... More

Friday, September 22, 2023

vscode: Remote Access and Code Editing

vscode: Remote Access and Code Editing Step 1: Install vscode Step 2: Install Remote-SSH Extension Step 3: Create Remote-SSH Connection Step 4: Open Folder on Remote Server Step 5: Open a terminal, edit some code, run some code! In addition to these instructions, you can find a video tutorial here: Video: vscode: Remote Access... More

Wednesday, December 21, 2022

SSH Key Exchange Errors

Annually the SCS Linux Network hosts are upgraded, and the ssh-keys will no longer match. If you know that the server has been upgraded and your ssh-keys no longer match, then it will be safe to accept the new ssh key. Your system administrator will be able to confirm if this is due to... More

Wednesday, December 21, 2022

Unable to negotiate: no matching key exchange method found.

Some ssh clients may complain with: "Unable to negotiate with 134.117.xxx.xxx port 22: no matching key exchange method found." The connect as follows: ssh -oKexAlgorithms=+diffie-hellman-group1-sha1 access.scs.carleton.ca Replace access.scs.carleton.ca with your destination... More

Tuesday, December 20, 2022

ssh error: too many authentication requests

When ssh'ing to access.scs.carleton.ca you may receive the error: Received disconnect: Too many authentication failures Disconnected There are at least two reasons for this message. If you provide a wrong password multiple times within a short period of time, it may be locked out - you will have to wait and then try again.This... More

Friday, January 29, 2021

SSH Connection with x2go Remote Desktop Client

SSH Connection with x2go Remote Desktop Client NOTE: This example uses x2go, but the connection settings are the same for other compatible remote desktop tools. Download x2go: here You can find a video demo of these instructions here: Connect to Remote Desktop via x2go (Video) Use the following settings to make the connection -... More

Friday, January 29, 2021

SSH Connection Using the putty SSH Terminal Client

SSH Connection Using the putty SSH Terminal Client NOTE: This example uses putty, but the settings are the same for any tool using ssh, scp, etc. Download Putty: here You can find a video demo of these instructions here: Connect Remotely via a putty terminal (video)   Enter settings into putty: Enter username /... More

Thursday, October 3, 2019

Passwordless SSH With Key Pairs

What is an SSH Key Pair? Why use Key Pairs? Comparing Password vs Key Pair Authentication Creating Key Pairs Authenticating and Connecting with Key Pairs Advanced Topic: Configuring SSH SSH allows you to securely connect to remote computers and virtual machines. With SSH, you can use a computer remotely through the terminal, transfer files... More

Thursday, September 12, 2019

Connecting to OpenStack Instances (SSH With PuTTY)

NOTE: This example uses putty, but the settings are the same for any tool using SSH, SCP, etc. Download Putty: here Use the following settings to make a terminal connection - Some of your settings will be different host: 134.117.216.10 - Replace this with your own instance's floating IP address username: student - default... More

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