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Common Problems

Problems Starting SCEPman

I deployed SCEPman from GitHub and it used to work, but now the Web App does not start anymore

If the error is '503 Cannot download ZIP', then the web app cannot download the ZIP with the application binaries from the URL configured in the app setting WEBSITE_RUN_FROM_PACKAGE (see Application Configuration).
The URL https://github.com/glueckkanja/gk-scepman/raw/master/dist/Artifacts.zip that we had recommended for GitHub deployments in earlier versions of this documentation redirects to another URL. Microsoft changed the behavior of some of their Web Apps and now some versions do not support redirects together with WEBSITE_RUN_FROM_PACKAGE. Hence, you need to change the URL to https://raw.githubusercontent.com/scepman/install/master/dist/Artifacts.zip.

SCEPman Azure Web App is not running

Check if the Azure resource is up and running.

Problems Issuing Certificates

Trusted Root Certificate is deployed but my Device Certificate via SCEP Profile results in an Error

The SCEP profile will result in an error if the certificate deployment was not successful. Errors can have several reasons:

SCEP certificate profile is configured with an error

This could happen when a wrong trusted root certificate was selected in the SCEP certificate profile. This is also shown in the event log:
  1. 1.
    Open the Windows Events application
  2. 2.
    Click Applications and Services Logs
  3. 3.
    Next, click Microsoft
  4. 4.
    Then, click Windows
  5. 5.
    Scroll down and search for DeviceManagement-Enterprise-Diagnostics-Provider and click it.
  6. 6.
    In the window which will appear, click Admin
  7. 7.
    Scroll through the list and search for event ID 32
  8. 8.
    It contains a short error report
    • SCEP: Certificate enrollment failed. Result (The hash value is not correct.).

My Certificate does not have the correct OCSP URL Entry

This is just a problem before version 1.2
If the device certificate has a localhost URL for the OCSP entry in the certificate like this:
The App Service is missing an important application setting with the name AppConfig:BaseUrl set to the azurewebsite URL. To fix this, add the variable and save the App Service config:
AppConfig:BaseUrl
https://scepman-XXXXX.azurewebsites.net
Delete this certificate from the device and do the MDM sync. If you did it you will see a proper URL for the OCSP entry:

My SCEP configuration profile shows pending and is not applied

The SCEP configuration profile depends on the Trusted Root certificate profile. Assign both profiles to the same Azure Active Directory user or device group to make sure the user or device overlaps and both profiles are targeted to the device. Do not mix user and device groups. If you see pending as status for the configurations profiles in Intune for a long time, the assignment is probably wrong.

Windows 10 devices cannot enroll with AutoPilot

Currently, some Windows 10 devices do not have the correct time during the OOBE experience. This is not easy to see, since the screen shows no clock. This causes a problem with newly issued certificates, as they are not yet valid. Windows then discards these "invalid" certificates and shows an error. Certificates are issued 10 minutes in the past by default to address smaller clock issues, but we have recently seen Windows 10 devices that are up to 9 hours behind time.
You may proceed with the enrollment and once this is finished, the device will get a certificate successfully, as the clock is correct then. You may also use the new option AppConfig:ValidityClockSkewMinutes to date back certificates for more than 10 minutes. Use 1440 minutes to date back the certificates for a whole day. This will be the default for new SCEPman installations to address this issue.

Problems with the Validity of Certificates

Check local certificate on a Windows machine

First, you need to check the validity of the device certificate. Therefore, open a command prompt as administrator and type the following command:
certutil -verifyStore MY
Look at the certificate with the device ID issued by the SCEPman-Device-Root-CA-V1 and verify if the certificate is valid (see last line).
To verify that the OCSP responder is working, you can look at the OCSP url cache with the following command:
certutil -urlcache OCSP

Check certificates from other machines

As an alternate you can export the device certificate and use certutil on a Windows machine to display a small certutil UI for the OSCP check:
certutil -url <path-to-exported-device-certificate>

Revoke a user

If you want to revoke a user certificate, you have two options:‌
  1. 1.
    Deleting the user from Azure AD or
  2. 2.
    Block sign-in for the user
If you want to revoke a device certificate, you have multiple options depending on AppConfig:IntuneValidation:DeviceDirectory:
  1. 1.
    Azure AD: Delete or disable the device (AAD Portal: "Devices" - "All devices").
  2. 2.
    Intune: Delete the device or trigger a remote action (several managements states like "WipePending" automatically revoke certificates as stated under AppConfig:IntuneValidation:RevokeCertificatesOnWipe).
  3. 3.
    Both directories: Execute actions for Azure AD and Intune as described.
For more details on device directories, please read the article Device Directories.
The following example revokes a device certificate via Azure AD:
  1. 1.
    Navigate to Devices - All devices in your Azure AD
  2. 2.
    Choose a device
  3. 3.
    Click Disable
Next, type in the following command again:
certutil -verifyStore MY
As you can see in the last line, the Certificate is REVOKED
When you enable the device in Azure AD again and you type in the command from above again, the certificate should be marked as valid.
It can take up to 5 minutes before the prompt 'Marked as valid' appears.

Access Point cannot verify an authentication certificate that SCEPman has issued

Symptoms: Cisco ISE shows an OCSP unreachable error. Aruba ClearPass also has this problem. The server, seemingly SCEPman, answers with an TCP reset packet to the OCSP request.
Cause: Both Cisco ISE as well as Aruba ClearPass do not support HTTP 1.1 when looking up OCSP and do not send a host header in their OCSP request. Therefore, they cannot connect to a general SCEPman instance running on Azure App Services. The error message may look like this:
Solution: Please see here.

Device Certificates on my Android (dedicated) systems are not valid

On Android (dedicated) systems, Intune or Android accidentally puts the Intune Device ID into the certificate instead of the AAD Device ID in random cases, although you configure the variable in the SCEP configuration profile. SCEPman then cannot find a device with this ID in AAD and therefore considers the certificate revoked.
This happens only when you use the Azure AD shared mode for enrollment method for corporate-owned dedicated devices instead of the default mode. If you use the default mode for Token types Corporate-owned dedicated device, you will not be affected by the problem. Intune will still put the Intune Device ID into the certificate instead of the AAD Device ID, but they will be the same for the default mode, so it does not matter. To change the enrollment mode, go to the Android enrollment settings of Microsoft Endpoint Manager admin center and choose Corporate-owned dedicated device (default) instead of Corporate-owned dedicated device with Azure AD shared mode. Please refer to the Microsoft documentation for the implications of this selection.
We are currently working with Microsoft to solve this issue in all configurations. Please contact our support if you are also affected.
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Outline
Problems Starting SCEPman
I deployed SCEPman from GitHub and it used to work, but now the Web App does not start anymore
SCEPman Azure Web App is not running
Problems Issuing Certificates
Trusted Root Certificate is deployed but my Device Certificate via SCEP Profile results in an Error
SCEP certificate profile is configured with an error
My Certificate does not have the correct OCSP URL Entry
My SCEP configuration profile shows pending and is not applied
Windows 10 devices cannot enroll with AutoPilot
Problems with the Validity of Certificates
Check local certificate on a Windows machine
Check certificates from other machines
Revoke a user
Access Point cannot verify an authentication certificate that SCEPman has issued
Device Certificates on my Android (dedicated) systems are not valid