TTLC Help Desk Announcements
UHD's Canvas instance is hosted on the cloud by Instructure, rather than hosted by on-premise servers. System updates happen automatically, usually biweekly. Updates could cause the system to become unavailable, or otherwise affect user sessions. The goal is for UHD's Canvas to be available 365 days per year, 24 hours per day.
Instructure maintains a page showing the status of Canvas and any outages. (Outages for third-party tools such as Turnitin, Panopto, and Perusall will not be included in Instructure's list.)
Contact the TTLC Help Desk if you have questions at TTLCHelp@uhd.edu
DUO Access Issue - Canvas Login Error (504 Gateway Time-out)
Incident Occurrence: 2/23/2026 at approx. 8:00 AM - RESOLVED at 12:10 PM, 2/23/26
Description: Cisco Duo is investigating an issue where 504 Gateway timeouts are present when attempting to access Canvas.
Impact: This issue is impactiing all users that have not already been authenticated into Canvas withing the previous 12 hours from the date and time of the incident ocurring.
- DUO was temporarily disabled at around 9:55 AM for users to have access to affected applications.
- DUO was re-enabled at 12:10 PM for all users across UHD.
Please visit the Duo support article page for more information.
LockDown Browser (Mac and iPad) Failing to Launch with Canvas New Quizzes
Incident Occurrence: 2/19/2026 at approx. 10am - RESOLVED at 6:00 PM, 2/19/26
Description: Canvas and Respondus are investigating an issue relating to Canvas New Quizzes that causes LockDown Browser for Mac and iPad to fail at startup.
Impact: This issue does NOT affect LockDown Browser forWindows or Chromebook. Those platforms may be used as a temporary workaround while Instructure and Respondus investigate. Issue only affects iOS operating systems:
- LockDown Browser for iPad: Displays a blank screen after the begin button is pressed
- LockDown Browser for Mac: Displays error code -379 after the begin button is pressed
Please visit the Respondus support article page for more information.
Mac OS users - Respondus Lockdown Browser Known Issue
Description: This issue only impacts Mac users on Canvas, students are seeing an error message when attempting to access their quiz links when using the Respondus browser.
Announcement: Please update your Respondus Lockdown Browser application to prevent issues with accessing quizzes on Canvas.
LockDown Browser version for Mac impacted:
- All versions using 2.1.1.04 and older
- This hotfix release contains a fix for Canvas Classic exams accessed through the Assignments tab.
- Download the latest Mac version for Respondus
- Existing installs of LockDown Browser will not update automatically. To obtain the latest version (2.1.1.05) use the "Check for Update" feature.
- Need help updating your LockDown Browser?
Please visit the Respondus support article page for more information.
Be Sure to Update LockDown Browser
Description: Many of LockDown Browser's Known Issues are likely to be fixed by updating your software. Updating your personal browser should resolve the issue for exams that don't require Respondus. In the case of Lockdown Browser, students will need to update their browser by following the steps detailed in the link below:
Recurring Announcement
Maintenance Windows: 1st and 3rd Thursday of the month from 2:05am to 4:05am, Canvas may be unavailable (this is the regular biweekly maintenance time). During this time you may experience intermittent issues when attempting to login to Canvas. It is not recommended to access information in your courses or to submit assessments during this period.