UTS: weekend monthly maintenance schedule for January to December 2021

University Technology Services (UTS) has established standardized maintenance windows for repairs, installations, upgrades, testing, patches, and other processes and procedures, which may cause limited or interrupted access to McMaster’s IT system resources.

Maintenance is scheduled over a weekend once per month. During these scheduled maintenance windows, users may experience anything from slow response, limited access, or no connectivity; or may experience no interruption whatsoever.

Scheduled Mosaic maintenance will start no earlier than end of business on Friday (5:00 p.m.) and will be completed no later than Monday morning (8:00 a.m.). Mosaic updates could impact services provided via the Mosaic platform. Information on potential outages will be posted directly to Mosaic Alerts.

Scheduled Systems and Network maintenance will be performed on Sunday between 6:00 a.m. and 12:00 p.m. Network maintenance could impact services such as software applications, servers, voice, video and data communications, local area networks (LAN), wide area networks (WAN), wireless networking (WLAN), Internet, and ORION.

UTS will notify the campus community of anticipated impacts and timing in advance of scheduled maintenance windows. Please note that these windows are subject to change in order to accommodate University activities.

The following dates and times have been scheduled for the 2021 calendar year:

Month Monthly Mosaic Maintenance Dates

(From Friday at 5:00 p.m. – Monday at 8:00 a.m.)

Systems & Network Maintenance


(Sunday between 6:00 a.m. and 12:00 p.m.)


January 22 – 23 24
February 26 – 27 28
March 26 – 27 28
April 23 – 24 25
May 28 – 29 30
June 25 – 26 27
July 23 – 24 25
August 20 – 21 22
September 24 – 25 26
October 22 – 23 24
November 19 – 20 21
December 17 – 18 19

The UTS website will be updated annually to include the dates for the upcoming calendar year along with exceptions and other details regarding what to expect during maintenance windows.

For a list of known service disruptions or scheduled maintenance, please visit the UTS Service Dashboard. For further questions and support, please visit the UTS website.