Windows Updates (WSUS) -- error 8024402c -- Windows Server 2012, domain vs workgroup ?

Any ideas on how can I get the below #1 to work

 1. do "check for windows updates" when
     Windows Server 2012 R2 server is on "DOMAIN"
 2. get 8024402c ERROR
 3. change sever to "WORKGROUP", reboot
 4. do "check for windows updates" again
 5. works, using the same DNS as when it was on the "DOMAIN"
 6. change back to "DOMAIN", reboot
 7. do "check for windows updates" again
 8. fails again
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Seth SimmonsSr. Systems AdministratorCommented:
check your group policy; make sure WSUS server is configured correctly
should have the FQDN for the server name followed by port
verify the correct port.  i've often see this missed
on 2012 and higher, default port is 8530; 8531 if using SSL
something like https://wsus.mydomain.local:8530

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Adam BrownSr Solutions ArchitectCommented:
Look at the Group Policies on your domain for any GPOs that have settings that configure WSUS. If you do, follow Seth's recommendation to ensure the URL is set properly to connect to WSUS.
Tom CieslikIT EngineerCommented:
In WSUS console check if server is add to some computer group where updates are approved for install
Check you GPO is this server is selected as Update source with assigned (in process of installation) Port
Make sure this port is open on WSUS server for Domain Network

DonNetwork AdministratorCommented:
Check your gpo firewall settings

Verify the client is getting the WSUS settings from a cmd prompt

reg query HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate /s
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