Can't connect to the Internet when you use two separate APNs in Windows 8.1


Consider the following scenario:
  • You have a mobile broadband module or adapter installed on a Windows 8.1-based computer.
  • The module or adapter uses an access point name (APN) to connect to the Internet.
  • You first connect to an APN that uses Dynamic Host Configuration Protocol (DHCP) to obtain an IP address and a default gateway.
  • You disconnect from the APN and then connect to another APN that does not use DHCP (such as a device-configured APN) to obtain an IP address and default gateway.

After you connect to the second APN, you cannot access the Internet.


This problem occurs because the IP address and gateway that were assigned by DHCP in the first APN connection is incorrectly retained in the second APN connection. This behavior occurs because the DHCP information is handled incorrectly in the Wmbclass.sys driver.


Hotfix information

A supported hotfix is available from Microsoft Support. 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, go to 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 have Windows 8.1 installed.

Restart requirement

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

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

File information


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


Learn about the terminology  that Microsoft uses to describe software updates.

Article ID: 2906890 - Last Review: Dec 12, 2013 - Revision: 1

Windows 8.1, Windows 8.1 Enterprise, Windows 8.1 Pro