Hello mfr_
Firstly, I would recommend checking if your Dell Optiplex 5080 Tower is compatible with Windows Server 2012 R2 Standard. You can check the compatibility by visiting the Dell website and checking the system requirements for Windows Server 2012 R2 Standard.
Please refer to this document: System Requirements and Installation Information for Windows Server 2012 R2 | Microsoft Learn
If your Dell Optiplex 5080 Tower is compatible with Windows Server 2012 R2 Standard, then I would suggest trying the following steps:
- Check if the network adapters are enabled in the BIOS settings.
2.Try running the Windows Update troubleshooter to fix any issues with Windows Update. As you describe, Windows automatic updates don't work, so I recommend that you install the updates manually in this link: Microsoft Update Catalog
Windows Server Update History: Windows 8.1 and Windows Server 2012 R2 update history - Microsoft Support
- Try upgrading Windows Server 2012 R2 to Windows Server 2016 or Windows Server 2019 to see if the issue is resolved.
Note: Microsoft support for Windows Server 2012 R2 will end on October 10, 2023, please upgrade or purchase ESU as soon as possible, please refer to this document:
Product Lifecycle FAQ - Extended Security Updates | Microsoft Learn
Best Regards,
Hania Lian