Consider the following scenario:
You have a computer that is running Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2.
The computer does not support TCP/IP-offload capabilities.
You configure the computer as a Wi-Fi hot spot.
You use a device to connect to an FTP server through the Wi-Fi hot spot.
In this scenario, you cannot connect to the FTP server.
This issue occurs because of a TCP checksum computation issue in a system driver.
To resolve this issue, install update rollup 2911106. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2911106 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: January 2014
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates