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Decorative photo: masked students using laptops.

Firewall upgrade will cause network outages morning of November 24

Submitted by stauffeg on Wed, 11/17/2021 - 12:42 PM

The campus border firewalls will be upgraded to new software from 5:45 a.m. to 6:30 a.m. on Wednesday, November 24. During this upgrade window all network traffic to and from the campus will experience an interruption of approximately 15 minutes. This may result in the need to reconnect to services if they do not automatically reconnect. On-campus network traffic between on-campus machines should not be affected by this maintenance.

Here are some specific examples of how campus services will be impacted:

While using the campus network (UCB Wireless, UCB Guest, Eduroam, wired network):

  • Unable to access resources outside the campus network (Canvas, Salesforce,, etc.)
  • Unable to access email accounts (Exchange Online, Gmail)
  • Able to access on-campus resources (
  • Able to use the campus VoIP phone service

While using a different network (home, coffee shop, cellular data network, etc.):

  • Unable to access sites and other resources housed on the campus network
  • Unable to connect to CU Boulder Virtual Private Network (VPN)
  • Able to access email accounts (Exchange Online, Gmail)
  • Able to access services not housed on the campus network (Canvas, Salesforce, etc.)

This upgrade is necessary to optimize traffic processing and increase firewall performance to alleviate some minor packet loss we have observed. The firewall will also be upgraded to the latest vendor-recommended software version.