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Cannot upload a file larger than 7 MB over TLS 1.0 to a server that is running IIS

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Symptoms

On a computer that is running Windows Vista, Windows 7, or Windows Server 2008 R2, you may be unable to upload a file larger than 7 megabytes (MB) over Transport Layer Security (TLS) 1.0 to a server that is running Internet Information Services (IIS). The issue occurs with non-Microsoft clients only. A network trace between the client and server shows that the IIS TCP window size drops to 0 (zero), and the server cannot recover.

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Cause

The issue occurs because the HTTP module does not account for the unnecessary 0 bytes buffer. This creates a condition in which HTTP can no longer accept data from the TCP layer. Therefore, the TCP window size drops continuously and does not recover.

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Resolution

To resolve this issue, switch to a later version of TLS.

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Keywords: kbexpertiseadvanced, kbsurveynew, kbtshoot, kb

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Article Info
Article ID : 3056424
Revision : 1
Created on : 1/7/2017
Published on : 6/22/2015
Exists online : False
Views : 214