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Cisco Secure Access Help Manage PAC Files Managing PAC File Deployments

Last updated: Aug 07, 2025

Managing PAC File Deployments

Integrating the Secure Access PAC file or custom PAC files on the user devices in your organization so that all browser-based traffic is proxied is straightforward. For more information, see:

Note: Microsoft has deprecated PAC file support for the file:// and ftp:// protocols in Windows 10 on Edge. Hosting the PAC file on the local machine with the Edge browser is not supported. For more information, see Windows 10 does not read a PAC file referenced by a file protocol.

We recommend that you bypass these domains in your environment for traffic with TCP on ports 80 and 443:

  • ocsp.int-x3.letsencrypt.org
  • isrg.trustid.ocsp.identrust.com
  • *.opendns.com
  • *.sse.com
  • *.umbrella.com
  • *.okta.com
  • *.oktacdn.com
  • *.pingidentity.com
  • secure.aadcdn.microsoftonline-p.com