0x80072EFD error when trying to activate Windows with a KMS server


When trying to activate a Windows 2008 with a KMS server, you get the following error message:
"C:\Windows\system32>cscript slmgr.vbs -ato
Microsoft (R) Windows Script Host Version 5.7
Copyright (C) Microsoft Corporation. All rights reserved.

Activating Windows Server(R), ServerStandard edition (56df4151-1f9f-41bf-acaa-29
41c071872b) ...
Run 'slui.exe 0x2a 0x80072EFD' to display the error text.
Error: 0x80072EFD"

Error code 0x80072EFD means: "A connection with the server could not be established".


The error message means that slmgr.vbs couldn't connect to the activation server.

1. Make sure the KMS server isn't firewalled by either Windows Firewall or another software firewall program.
2. Make sure the KMS server has a _vlmcs._tcp.domain.whatever SRV record.
3. Make sure no other server has a _vlmcs._tcp.domain.whatever SRV record.

Affected software:

Microsoft Windows 2008
Microsoft Windows 2008 R2
Microsoft Windows Vista

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