After testing SUP for around 20 clients initially and since everything felt ok , i went ahead and removed the WSUS policy for our OU.

We have 2500 Computers in our OU and i expected them to all scan to the new SUP server and be ready for updates through SCCM.

Unfortunately since yesterday only 300 client show as successfully completed scan in the reports.

Around 2100 client show scan failed 

What did i do wrong.

I thought clients were putting load on the SUP server , so i gave it more CPU and Memory 

But still the success rate has not improved.

Most common error message:

-2147219822  -- Around 600 clients have this error (mostly these machines were offline)

-2147012894  -- Around 1300 clients have this error 

As mentioned 300 have completed scan successfully.

Any advice.

-2147219822 080040692 Group policy conflict
-2147012894 0x80072EE2 Network connection: Windows Update Agent encountered transient network connection-related errors

The scan results are improving now, possibly it takes time for SUP to settle in when 2000 clients are moved from old WSUS .

I think i will try and wait for couple of days to see how it goes.