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PENDING WSUS with SCCM not synchronization

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Hello
Thanks for reading my post, I have been going around in circles for weeks
I am running Config Manager 2006 on a Windows 2012 R2 server. This server is running all of my roles

I am trying to set up my SUP role that seems to be installed but fails to run the first synchronization with the error (below) in my wsyncmgr.log
"STATMSG: ID=6703 SEV=E LEV=M SOURCE="SMS Server" COMP="SMS_WSUS_SYNC_MANAGER" SYS=HOST-SCCM.GENERICSYSTEM.TEST SITE=TSB PID=2660 TID=3568 GMTDATE=Sun Nov 29 13:17:19.356 2020 ISTR0="Microsoft.SystemsManagementServer.SoftwareUpdatesManagement.WsusSyncAction.WSyncAction.SyncWSUS" ISTR1="UssCommunicationError: WebException: The underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.~~at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)" ISTR2="" ISTR3="" ISTR4="" ISTR5="" ISTR6="" ISTR7="" ISTR8="" ISTR9="" NUMATTRS=0"

Troubleshooting I have tried (highlights)
Switched off Windows Firewall - No Change
Confirmed WSUS ports used are 8530 and 8531
Removed the Sup Role - Rebooted - Removed the WSUS role - Rebooted - Deleted the WSUS folder and removed WSUS site from IIS - Rebotted - Reinstalled - The same issue
Rebuilt the server (fresh OS) and reinstalled everything - same issue

Anyone has seen this before
 

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he underlying connection was closed: An unexpected error occurred on a send. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host - Do you have any other security device that sites between your servers and Internet ?.
 
Hello
No other security our AV - this is a test environment hence the lack of security
internet access seems to be fine I am able to access other websites
 

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