KMS Server

Reset to Default

To remove KMS from a server you need to reset the license key back to the default, this is achieved by running the following command;
Microsoft's Knowledge base on KMS Keys

slmgr /upk
slmgr /ipk <license key goes here>

Operating System Edition	Product Key
Windows Vista Business	YFKBB-PQJJV-G996G-VWGXY-2V3X8
Windows Vista Business N	HMBQG-8H2RH-C77VX-27R82-VMQBT
Windows Vista Enterprise	VKK3X-68KWM-X2YGT-QR4M6-4BWMV
Windows Vista Enterprise N	VTC42-BM838-43QHV-84HX6-XJXKV
Windows Server 2008 Datacenter	7M67G-PC374-GR742-YH8V4-TCBY3
Windows Server 2008 Datacenter without Hyper-V	22XQ2-VRXRG-P8D42-K34TD-G3QQC
Windows Server 2008 for Itanium-Based Systems	4DWFP-JF3DJ-B7DTH-78FJB-PDRHK
Windows Server 2008 Enterprise	YQGMW-MPWTJ-34KDK-48M3W-X4Q6V
Windows Server 2008 Enterprise without Hyper-V	39BXF-X8Q23-P2WWT-38T2F-G3FPG
Windows Server 2008 Standard	TM24T-X9RMF-VWXK6-X8JC9-BFGM2
Windows Server 2008 Standard without Hyper-V	W7VD6-7JFBR-RX26B-YKQ3Y-6FFFJ
Windows Web Server 2008	WYR28-R7TFJ-3X2YQ-YCY4H-M249D
Windows 7 Professional	FJ82H-XT6CR-J8D7P-XQJJ2-GPDD4
Windows 7 Professional N	MRPKT-YTG23-K7D7T-X2JMM-QY7MG
Windows 7 Enterprise	33PXH-7Y6KF-2VJC9-XBBR8-HVTHH
Windows 7 Enterprise N	YDRBP-3D83W-TY26F-D46B2-XCKRJ
Windows 7 Enterprise E	C29WB-22CC8-VJ326-GHFJW-H9DH4
Windows Server 2008 R2 HPC Edition	FKJQ8-TMCVP-FRMR7-4WR42-3JCD7
Windows Server 2008 R2 Datacenter	74YFP-3QFB3-KQT8W-PMXWJ-7M648
Windows Server 2008 R2 Enterprise	489J6-VHDMP-X63PK-3K798-CPX3Y
Windows Server 2008 R2 for Itanium-Based Systems	GT63C-RJFQ3-4GMB6-BRFB9-CB83V
Windows Server 2008 R2 Standard	YC6KT-GKW9T-YTKYR-T4X34-R7VHC
Windows Web Server 2008 R2	6TPJF-RBVHG-WBW2R-86QPH-6RTM4
Windows 8 Professional	NG4HW-VH26C-733KW-K6F98-J8CK4
Windows 8 Professional N	XCVCF-2NXM9-723PB-MHCB7-2RYQQ
Windows 8 Enterprise	32JNW-9KQ84-P47T8-D8GGY-CWCK7
Windows 8 Enterprise N	JMNMF-RHW7P-DMY6X-RF3DR-X2BQT
Windows 8.1 Professional	GCRJD-8NW9H-F2CDX-CCM8D-9D6T9
Windows 8.1 Professional N	HMCNV-VVBFX-7HMBH-CTY9B-B4FXY
Windows 8.1 Enterprise	MHF9N-XY6XB-WVXMC-BTDCT-MKKG7
Windows 8.1 Enterprise N	TT4HM-HN7YT-62K67-RGRQJ-JFFXW
Windows 10 Professional	W269N-WFGWX-YVC9B-4J6C9-T83GX
Windows 10 Enterprise	NPPR9-FWDCX-D2C8J-H872K-2YT43
Windows 10 Education	NW6C2-QMPVW-D7KKK-3GKT6-VCFB2
Windows 10 Enterprise 2015 LTSB	WNMTR-4C88C-JK8YV-HQ7T2-76DF9
Windows 10 Professional N	MH37W-N47XK-V7XM9-C7227-GCQG9
Windows 10 Enterprise N	DPH2V-TTNVB-4X9Q3-TJR4H-KHJW4
Windows 10 Education N	2WH4N-8QGBV-H22JP-CT43Q-MDWWJ
Windows 10 Enterprise 2015 LTSB N	2F77B-TNFGY-69QQF-B8YKP-D69TJ
Windows Server 2012 Core	BN3D2-R7TKB-3YPBD-8DRP2-27GG4
Windows Server 2012 Core N	8N2M2-HWPGY-7PGT9-HGDD8-GVGGY
Windows Server 2012 Core Single Language	2WN2H-YGCQR-KFX6K-CD6TF-84YXQ
Windows Server 2012 Core Country Specific	4K36P-JN4VD-GDC6V-KDT89-DYFKP
Windows Server 2012 Server Standard	XC9B7-NBPP2-83J2H-RHMBY-92BT4
Windows Server 2012 Standard Core	XC9B7-NBPP2-83J2H-RHMBY-92BT4
Windows Server 2012 MultiPoint Standard	HM7DN-YVMH3-46JC3-XYTG7-CYQJJ
Windows Server 2012 MultiPoint Premium	XNH6W-2V9GX-RGJ4K-Y8X6F-QGJ2G
Windows Server 2012 Datacenter	48HP8-DN98B-MYWDG-T2DCC-8W83P
Windows Server 2012 Datacenter Core	48HP8-DN98B-MYWDG-T2DCC-8W83P
Windows Server 2012 R2 Server Standard	D2N9P-3P6X9-2R39C-7RTCD-MDVJX
Windows Server 2012 R2 Datacenter	W3GGN-FT8W3-Y4M27-J84CP-Q3VJ9
Windows Server 2012 R2 Essentials	KNC87-3J2TX-XB4WP-VCPJV-M4FWM
Windows Server 2016 Datacenter	CB7KF-BWN84-R7R2Y-793K2-8XDDG
Windows Server 2016 Standard	WC2BQ-8NRM3-FDDYY-2BFGV-KHKQY
Windows Server 2016 Essentials	JCKRF-N37P4-C2D82-9YXRT-4M63B

So to reset the license key for a Windows 8 Professional you would run this command;

slmgr /ipk NG4HW-VH26C-733KW-K6F98-J8CK4
slmgr /ato 

Set KMS

While we wait for the incorrect KMS servers to be removed from the domain, you can manually direct the Vista client you are having trouble with to a specific server running KMS by running this command;

slmgr /skms myserver.domain.com
slmgr /ato 

For further information review:

• Deployment Guide
• KMS Client Setup Keys