The first byte of the proxy settings binary was '60' but should have been 0x46.

[ole1986]

Problem description

Received Error:
The first byte of the proxy settings binary was '60' but should have been 0x46.

But DefaultConnectionSettings and SavedLegacySettings is a completely fresh entry

Verbose logs

AUSFÜHRLICH: [xxx]:                            [[ProxySettings]ManualProxy] Test-TargetResource: Checking the CurrentUser proxy settings to ensure 'Present'.
AUSFÜHRLICH: [xxx]:                            [[ProxySettings]ManualProxy] Test-TargetResource: Checking that the CurrentUser proxy settings 'DefaultConnectionSettings' are in the desired state.
AUSFÜHRLICH: [xxx]: LCM:  [ BeendenTesten   ]  [[ProxySettings]ManualProxy]  in 0.1750 Sekunden.
Die PowerShell DSC-Ressource "DSC_ProxySettings" konnte die Funktion "Test-TargetResource" nicht ausführen. Fehlermeldung: "System.InvalidOperationException: The first byte of the proxy settings binary was '60' but should have been 0x46." 
    + CategoryInfo          : InvalidOperation: (:) [], CimException
    + FullyQualifiedErrorId : ProviderOperationExecutionFailure
    + PSComputerName        : xxx

DSC configuration

ProxySettings ManualProxy
        {
            Target = 'CurrentUser'
            Ensure = 'Present'
            EnableAutoDetection = $false
            EnableAutoConfiguration = $false
            EnableManualProxy = $true
            ProxyServer = 'proxy.xxx.local:3128'
            ProxyServerExceptions = '*.xxx.local', '*.e-xxx.de', '*.xx.xxxx.de'
            ProxyServerBypassLocal = $true
        }

Suggested solution

Allow updating the proxy settings

Operating system the target node is running

OsName               : Microsoft Windows 10 Pro
OsOperatingSystemSKU : 48
OsArchitecture       : 64-Bit
WindowsVersion       : 2009
WindowsBuildLabEx    : 19041.1.amd64fre.vb_release.191206-1406
OsLanguage           : de-DE
OsMuiLanguages       : {de-DE}

PowerShell version and build the target node is running

Name                           Value
----                           -----
PSVersion                      5.1.19041.3031
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.19041.3031
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

NetworkingDsc version

NetworkingDsc 9.0.0   C:\Program Files\WindowsPowerShell\Modules\NetworkingDsc\9.0.0\NetworkingDsc.psd1

[ole1986]

Hint for some reason it was reading the

Computer\HKEY_USERS.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections

instead of CurrentUser