Skip to main content

TTLC Help Desk Announcements

UHD's Canvas instance is cloud-hosted by Instructure and receives automatic system updates, typically on a biweekly basis. While these updates are designed to improve performance and reliability, they may occasionally cause temporary service interruptions or affect active user sessions. UHD's goal is to provide Canvas availability 24 hours a day, 365 days a year.

Instructure maintains a public status page that reports the current status of Canvas and any related outages. Please note that outages affecting third-party tools, such as Turnitin, Panopto, and Perusall are not included on Instructure's status page.

 
To report an issue, please contact UHD Canvas Support at (713) 221-2786 or via email at TTLCHelp@uhd.edu.
 

Announcements

 

DUO Access Issue - Canvas Login Error (504 Gateway Time-out)

Incident Window: February 23, 2026 | Approximately 8:00 AM - 12:10 PM (Resolved)

Description: Cisco Duo experienced an issue resulting in 504 Gateway Timeout errors when users attempted to authenticate and access Canvas.

Impact: This issue affected users who had not authenticated into Canvas within the previous 12 hours prior to the incident.

Resolution:

  • 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.

For additional details, please refer to the Duo support article page.

 

LockDown Browser (Mac and iPad) Failing to Launch with Canvas New Quizzes

Incident Window: February 19, 2026 | Approximately 10:00 AM - 6:00 PM (Resolved)

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:

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:

How to update LockDown Browser

 

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.