Archives: Technical Support

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

Wednesday, December 6, 2023

Undergraduate Computer Lab News – Fall 2023 & Winter 2024

Did you know?  The school of Computer Science has five undergraduate computer labs that BCS students can use in the Herzberg building: SCS Computer Labs  HP3115 and HP4115 can be used as study space and group work by anyone registered in a COMP course. COMP students can also use HP4155 when its free.  Third... 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, September 20, 2023

Renovated TA Center Opens at SCS 

The School of Computer Science opened its newly renovated Teaching Assistant (TA) laboratory during their Open House on Tuesday September 19, 2023. The university has invested in upgrading the undergraduate Computer Science labs and resources. The changes include a renovated TA center and BCS laboratories as well as further investment in the SCS... More

Wednesday, September 6, 2023

VPN Changes Beginning Fall 2023

This most directly impacts students who are using the SCS Openstack, as the SCS Openstack can only be accessed via a Carleton network. So from home you are required to use VPN to access the SCS... More

Thursday, June 8, 2023

How to reset your x2go session on the server side

Sometimes the x2go client will no longer connect to the x2go server on your target VM. Verify that: x2go client is configured correctly [https://carleton.ca/scs/2021/ssh-connection-with-x2go-remote-desktop-client/] Internet connection & Cisco VPN is working [Remote Access (VPN)] ssh connection (non-graphical) is working to the server [Secure... More

Thursday, January 19, 2023

VirtualBox Visual C++ Redistributable Error

The Windows version of the early VirtualBox 7.x.x installers no longer include the Microsoft Visual C++ 2019 Redistributable Package as part of the installer. This is due to a license change by Microsoft that changes how this can be packaged with other software. It is expected that Oracle will release an updated Windows VirtualBox... More

Thursday, January 5, 2023

VirtualBox 3D Acceleration Issue

VirtualBox can take advantage of some of the capabilities of your host computer's GPU to improve performance. However, enabling this feature can often cause problems. In particular, new version upgrades of VirtualBox often has 3D acceleration problems. These problems usually get ironed out as further updates are released. This issue has been... 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

Wednesday, December 14, 2022

IT Tip: Check if your accounts have been compromised

You may have a number of on line accounts and when account breaches occur you may not be informed that your account information has been compromised. Your account info could then be available on the internet, in a practice called a ‘pawned’ account. There is a great site out there that collects data breaches... More

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