After updating to Windows 11 22H2+, your network printers disappeared and "Add a printer" says "No printers were found" with error 0x00000bc4. Microsoft changed the default RPC protocol, breaking network printer discovery.
The Fix
powershell
Create the RPC policy key if it doesn't exist
New-Item -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Printers\RPC" -Force | Out-Null
Set RPC to use Named Pipes
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Printers\RPC" -Name "RpcUseNamedPipeProtocol" -Value 1 -Type DWord
Restart print spooler
Restart-Service -Name "Spooler" -Force
For domain environments, use Group Policy:
Computer Configuration > Administrative Templates > Printers > Configure RPC connection settings
Enable > RPC over Named Pipes
Verify
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