Azure AD Application Proxy Bad Gateway

PrasadWF 391 Reputation points
2022-11-05T08:30:46.437+00:00

Hi All,

I have one webserver VM in azure, not connected to any of the domain, it's normal VM in which IIS is installed and I have configure azure ad application proxy on this VM so that it authenticate my login page via azure ad.
But I am getting bad gateway error when trying to access the url.

Below is the error
Connection to the backend server failed. Error: (0x80072efe).

Please help

Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
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Accepted answer
  1. Givary-MSFT 29,681 Reputation points Microsoft Employee
    2022-11-09T06:24:56.717+00:00

    @PrasadWF Thank you for reaching out to us. As I understand you trying to access an application via Azure AD application proxy, getting bad gateway error.

    A bad gateway error indicates that the connector is unable to reach the backend application. make sure the application is published correctly.

    • A typo or mistake in the internal URL
    • Not publishing the root of the application. For example, publishing http://expenses/reimbursement but trying to access http://expenses
    • Problems with the Kerberos Constrained Delegation (KCD) configuration
    • Problems with the backend application

    You can also refer to this post where similar issue has been discussed.

    Reference:
    https://learn.microsoft.com/en-us/azure/active-directory/app-proxy/application-proxy-sign-in-bad-gateway-timeout-error
    https://learn.microsoft.com/en-us/azure/active-directory/app-proxy/application-proxy-troubleshoot

    Let me know if you have any further questions, please feel free to post back.

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