Uwe Gradenegger - Page 50 - Uwe Gradenegger

Certificate Enrollment Policy creation for Certificate Enrollment Policy Web Service (CEP) fails with error code "WS_E_INVALID_FORMAT".

Assume the following scenario:

A Certificate Enrollment Policy Web Service (CEP) is implemented in the network.
An enrollment policy is configured.
Testing the connection fails with the following error message:

Error: The input data was not in the expected format or did not have the expected value. 0x803d0000 (-2143485952 WS_E_INVALID_FORMAT)

Configuring the Network Device Enrollment Service (NDES) to work with a Group Managed Service Account (gMSA).

For security reasons, it may make sense to operate NDES with a Group Managed Service Account (gMSA) instead of a normal domain account. This option offers the charming advantage that the password of the account is changed automatically, and thus this step does not have to be done manually, which is unfortunately forgotten far too often.

Enabling Debug Logging for the Network Device Enrollment Service (NDES)

When trying to track down an error in the Network Device Enrollment Service (NDES), it is helpful to enable debug logging.

Change the static password of the Network Device Enrollment Service (NDES).

Assume the following scenario:

An NDES server is configured on the network.
The NDES server is configured to use a static password.
The static password should be changed.

The Network Device Enrollment Service (NDES) logs the error message "The Network Device Enrollment Service cannot be started (0x80070002). The system cannot find the file specified."

Assume the following scenario:

An NDES server is configured on the network.
HTTP error 500 (Internal Server Error) is reported when accessing the NDES application web page (mscep) and the NDES administration web page (certsrv/mscep_admin).
It will be the Event No. 2 stored in the application event log:

The Network Device Enrollment Service cannot be started (0x80070002). The system cannot find the file specified.

Renew the Registration Authority (RA) certificates for the Network Device Enrollment Service (NDES).

Once NDES has been in operation for some time (typically two years), one is faced with the challenge of renewing the Registration Authority (RA) certificates. Unfortunately, this process is not necessarily solved intuitively and is therefore described in more detail in this article.

The Network Device Enrollment Service (NDES) logs the error message "The Network Device Enrollment Service cannot retrieve one of its required certificates (0x80070057). The parameter is incorrect."

Assume the following scenario:

An NDES server is configured on the network.
HTTP error 500 (Internal Server Error) is reported when accessing the NDES application web page (mscep) and the NDES administration web page (certsrv/mscep_admin).
The events no. 2 and 10 stored in the application event log:

The Network Device Enrollment Service cannot be started (0x80070057). The parameter is incorrect.

The Network Device Enrollment Service cannot retrieve one of its required certificates (0x80070057). The parameter is incorrect.

Configuring the Network Device Enrollment Service (NDES) to operate without a password.

There are situations in which you cannot operate NDES with changing passwords. This is usually the case when there is either no management solution for the devices to be managed, or when it cannot handle changing passwords. Some solutions cannot handle a password at all.

In this case, you can configure NDES not to generate or require a password.

Public Key Infrastructures (PKI) basics

A public key infrastructure comprises all components (hardware, software, people and processes) required for the use of digital certificates. A PKI consists of one or more certification authorities (CA). The tasks of a PKI include:

Ensuring the authenticity of keys, i.e. establishing a traceable link between a key and its origin to prevent misuse.
Revocation of certificates, i.e., ensuring that decommissioned or compromised (e.g., stolen) keys can no longer be used.
Guarantee of liability (non-repudiation), i.e., the owner of a key cannot deny that it belongs to him.
Enforcement of policies, i.e. standardized procedures for the use of certificates.

Cryptography basics

The need for the use for cryptography can be summarized under the notion of ensuring secure communication in the presence of untrusted third parties. The goals of cryptography are:

To prevent data from falling into unauthorized hands (To ensure the confidentiality of data).
Find out if data has been modified during transport (Ensure the integrity of the data).
To clearly identify the source of the data (To ensure the authenticity of the data).
Additionally, users or computers can authenticate themselves using cryptography.

Configuring the Network Device Enrollment Service (NDES) to work with a static password.

In this case, you can configure NDES to generate a static password that will not change afterwards.

Creating a virtual smart card in a Hyper-V guest system

For test environments, it is often helpful to be able to work with smartcards. Below is a brief guide on how to set up a virtual smartcard in a Hyper-V guest using a virtualized Trusted Platform Module (TPM).

Domain Controller Certificate Templates and Smartcard Logon

In order for domain controllers to process smart card logins, they need certificates that provide this function.

(Re-)Installing the Microsoft Standard Certificate Templates

There may be cases where it is necessary to install the standard Microsoft certificate templates before installing the first Active Directory integrated certificate authority (Enterprise Certification Authority), or to reinstall the templates, for example because they have been corrupted or otherwise modified.

Editing the NTAuthCertificates object in Active Directory

In the default configuration, all certification authority certificates of Active Directory integrated certification authorities (Enterprise Certification Authority) are located in an object of type CertificationAuthority named NTAuthCertificates within the Configuration Partition of the Active Directory forest.