Article ID: 264908
NoticeWe strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:
When you connect to Microsoft Internet Information Services by using a browser, you may receive the following error message:
The Event Viewer may log the following error messages:
HTTP 403.15 - Forbidden: Client Access Licenses exceeded
Internet Information Services
The number of authenticated users has exceeded the number of Client Access Licenses (CAL).
Event ID: 27
Description: The server was unable to acquire a license for a SSL connection.
Event ID: 201
Description: No license was available for user <username> using product IIS 5.0.
This problem is caused by one of two things:
There are two counters at work in this scenario:
Service pack informationTo resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/260910/ )How to obtain the latest Windows 2000 service pack
Hotfix informationThe English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name ------------------------------------------------------ 6/1/2000 9:46:36AM 5.0.2195.2096 356,112 W3svc.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows 2000 Service Pack 2.
Note This section describes the behavior of the problem as it exists without the hotfix that is mentioned in the "Resolution" section.
SSL connection counting: Each SSL connection (anonymous or authenticated) decrements the SSL connection counter. This counter is initialized with the total number of CALs that are installed on the system. For example, if you have 10 CALs installed on a Web server, then the server will support up to 10 concurrent SSL connections.
To better understand CALs and SSL connection counting, review the following scenarios:
REFERENCESFor more information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/249149/ )Installing Microsoft Windows 2000 and Windows 2000 hotfixes
Article ID: 264908 - Last Review: June 19, 2014 - Revision: 4.0
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.