All clients not reporting to wsus

I am running wsus in 2012 r2 server. My wsus server is in 10.1.1.x subnet. I have 3 subnet running on client machines . While PC group in 101.1.x reporting successfully in wsus other two sinners 10.2.1.x and 10.3.1.x not reporting in wsus. Wsus picking up this machine how ever last report dates showing as “not yet reported”. I have tried the troubleshooting like restarting windows update service , stopping firewall, windows updates readiness tool, reset windows update component, Sfax scan.

What could be the reason ?
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Venkatesan TAssociate ConsultantAsked:
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David Johnson, CD, MVPRetiredCommented:
is the machine actually getting the group policy for wsus? -
Venkatesan TAssociate ConsultantAuthor Commented:
Yes all machines are getting group policy properly .
Mal OsborneAlpha GeekCommented:
Can these machines successfully ping the WSUS server?
Venkatesan TAssociate ConsultantAuthor Commented:
No they are not pinging . And from wsus server too I am unable to ping the different subnet machines
Mal OsborneAlpha GeekCommented:
OK, I that case it would seem either the firewall on the WSUS server is misconfigured, or you have a routing issue.

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