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After upgrading from Windows server 2008 R2 to Windows server 2012 R2 and reinstalling WSUS, there was always an error that the post-installation task WSUS could not be completed.

Cleaning the disk and removing the previous database did nothing.

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There was still a post-installation error notification.

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The solution is to remove the WSUS Administration site in IIS.

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After removing the WSUS Administration site and starting WSUS, the installation completes successfully.

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Next, the WSUS Setup Wizard starts as usual.

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There is an offer to take part in the Update Center quality improvement program.

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In the next step, there is a choice where the update will take place: from Microsoft Update or the upstream WSUS server.

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You can then configure WSUS on the proxy server.

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Only then can you start the connection.

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Connection process is not fast.

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You can then select languages for Microsoft products.

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The next step is to select products for updates.

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Next, select the update classes.

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Next, select the time to download updates.

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We start the initial synchronization.

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It is proposed to read the instructions for further configuration of WSUS.

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Everything is good - WSUS is working.