Proxy connection leaks when you open SSL WebSockets from a page in Internet Explorer 11 or Internet Explorer 10

Symptoms
When Internet Explorer 11 or Internet Explorer 10 establishes a new WebSocket connection to a WebSocket server over Secure Sockets Layer (SSL) through a proxy server, the number of active connections increases. After that connection is closed, the number of active connections does not decrease. Therefore, you can't establish a new connection to this WebSocket server after 12 connections because there is no available free connection.
Resolution
To fix this problem, install the most recent cumulative security update for Internet Explorer through Microsoft Update. Additionally, see the technical information about the most recent cumulative security update for Internet Explorer.

Note This update was first included in the MS16-001: Security update for Internet Explorer: January 12, 2016.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.

For more information about the WebSocket feature, see the WebSocket API.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.
Properties

Article ID: 3135236 - Last Review: 01/12/2016 18:46:00 - Revision: 1.0

Internet Explorer 11, Internet Explorer 10

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