Private Application access through Prisma Browser and Explicit proxy is failing with error ERR_TUNNEL_CONNECTION_FAILED

Private Application access through Prisma Browser and Explicit proxy is failing with error ERR_TUNNEL_CONNECTION_FAILED

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Created On 11/04/25 23:12 PM - Last Modified 12/10/25 02:45 AM


Symptom


  • Access to internal resources down via Prisma Browser and Explicit Proxy.
  • Access to public sites remains functional.
  • Private application not accessible initially via FQDN.
  • The same App is accessible through Prisma Access Browser /Explicit Proxy when using IP address.
  • The browser will present ERR_TUNNEL_CONNECTION_FAILED error


Environment


  • Prisma Browser
  • Prisma Access Explicit Proxy 
  • Private App Access through Prisma Access Explicit Proxy 
  • Private App Access through Prisma Access Browser
  • Authentication Bypass domain list


Cause


  • The private app domain was incorrectly configured under the Authentication bypass domain list for the Explicit Proxy.
  • The private app domains should not be included in the authentication bypass domain list, which caused a failure in private resource access.


Resolution


Ensure that private app domains are not configured under the authentication bypass domain list for Explicit Proxy. 



Additional Information


N/A

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