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[ScreenOS] Can a CSR be created without FQDN?



Article ID: KB30856 KB Last Updated: 24 Sep 2020Version: 2.0

A Certificate Signing Request (CSR) cannot be created without a Fully Qualified Domain Name (FQDN). This article describes how FQDN is defined in CSR.



The goal is to explain how FQDN is defined in a CSR.



No, a CSR cannot be created without FQDN. By default, SSG adds [hostname].[domain] as the FQDN value when generating a CSR. A specific FQDN can be configured with:

set pki x509 cert-fqdn <FQDN>

There are many security risks where publicly trusted certificates that are issued with a non-FQDN can be used to attack an enterprise using the same name for internal purposes. Therefore, it is by design that FQDN is a requirement.

Most publicly trusted SSL CAs have stopped issuing certificates with non-FQDN as a security consideration.

FQDN in a CSR is defined as follows:

  • With 'cert-fqdn' configured, a prepared CSR will have the configured 'cert-fqdn' as its FQDN entry.

  • Without any configuration in 'cert-fqdn', SSG automatically adds the [hostname].[domain] string as the FQDN.

  • Without any configuration in 'cert-fqdn', and both hostname and domain unset, a prepared CSR will have 'dot (.)' as the FQDN.

  • It is not possible to generate a CSR without any FQDN.


Modification History:

2020-09-24: Article checked for accuracy; article valid and relevant; no changes made


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