AnsweredAssumed Answered

Win 2008 R2 Server Fails to run MS update after RC4 cipher disabled

Question asked by Edward Tiller on Dec 10, 2014
Latest reply on Dec 11, 2014 by Adm Selec

I wanted to ping the group to see if anyone else had seen this. One of the public web servers on our network is running Windows 2008 R2. It is configured for TLS 1.0, 1.1, 1.2 with strong ciphers that support PFS. I recently removed the RC4 cipher TLS_RSA_WITH_RC4_128_SHA. After restarting, I found that I could not use Windows Update any longer. I would get a generic connection error: Error Code 80072EFE. When I added the RC4 cipher back in and restarted, I was able to use Windows Update again. I tried it on another Win 2008 R2 box and got the same result. Has anyone seen this, or does anyone know why disabling the RC4 cipher would cause Windows Update to fail? Thanks.

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