A CA does not replace space characters in URL paths for CRL distribution points and authority information access extensions on a computer that is running Windows Server 2012

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Essentials


Assume that you have a Windows Server 2012 computer that has the certification authority role (CA) installed. Additionally, assume that the CA name contains space characters. However, when a certificate is issued from this CA, the CA does not replace the space characters with "%20" in the URL paths for certificate revocation list (CRL) distribution points and authority information access extensions.

Note You can open the certificate and then click the Details tab to check the CRL Distribution Point field and Authority Information Access extensions.

You expect that the CA replaces all the space characters with "%20" in the URL paths for the CRL distribution points and authority information access extensions.


This hotfix is also available at Microsoft Update Catalog

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must be running Windows Server 2012.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

Request for Comments (RFC) specifications for URL paths that are published in issued certificates require URL encoding of special characters, and this includes space characters. Many clients, such as Windows clients, can correctly access URLs that are not encoded, and these clients are not affected by this problem. However, some third-party devices, such as some Cisco iOS devices, require the URLs to be encoded according to the RFC specifications for such devices to use these URLs correctly to perform certificate revocation checking.


See Description of the standard terminology that is used to describe Microsoft software updates for more information.