Hello Rajinder,
Please make sure the WSUS server and hardware meet the requirements introduced in the article below.
https://msdn.microsoft.com/en-us/library/dd939928(v=ws.10).aspx#client
Especially, please note that WSUS 3.0 SP2 supports the following client system. If there are client system not in the list, such as Windows 8.1, Windows 10, Windows server 2016 and so on, you may consider to use WSUS 4.0, which is only available on Windows
Server 2012, 2012R2 and 2016.
Windows 7
Windows Vista
Windows XP Professional
Windows Server 2008 R2
Windows Server 2008 with Service Pack 1 (SP1)
Windows Small Business Server 2008
Windows Small Business Server 2005
Windows Small Business Server 2003 or later versions
Microsoft Windows Server 2000 with Service Pack 4 (SP4)
Best regards,
Andy Liu
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