SUMMARY
Randomly, KNewStuff is not able to retrieve content and displays the error message "Loading of providers from file: http://download.kde.org/ocs/providers.xml failed". 

STEPS TO REPRODUCE
1. Open a KNewStuff dialogue.

OBSERVED RESULT
It randomly complains that the loading of the providers failed.

EXPECTED RESULT
It works.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
This is the output when running from the terminal:
QLayout: Attempting to add QLayout "" to KCModuleProxyInternal "", which already has a layout
qt.core.qobject.connect: QObject::connect: No such signal KFocusConfig::defaultsIndicatorsVisibleChanged(bool) in ./src/kcms/options/windows.cpp:67
QLayout: Attempting to add QLayout "" to KCModuleProxyInternal "", which already has a layout
QLayout: Attempting to add QLayout "" to KCModuleProxyInternal "", which already has a layout
QLayout: Attempting to add QLayout "" to KCModuleProxyInternal "", which already has a layout
QLayout: Attempting to add QLayout "" to KCModuleProxyInternal "", which already has a layout
kf.configwidgets: A widget named "kcfg_AllowKDEAppsToRememberWindowPositions" was found but there is no setting named "AllowKDEAppsToRememberWindowPositions"
kf.configwidgets: A widget named "kcfg_ShadeHover" was found but there is no setting named "ShadeHover"
kf.configwidgets: A widget named "kcfg_ShadeHoverInterval" was found but there is no setting named "ShadeHoverInterval"
kf.configwidgets: A widget named "kcfg_Placement" was found but there is no setting named "Placement"
kf.configwidgets: A widget named "kcfg_ActivationDesktopPolicy" was found but there is no setting named "ActivationDesktopPolicy"
qml: Page SubCategoryPage_QMLTYPE_112(0x55a22a4cfef0) is already in the PageRow
qml: Pushed pages do not conform to the rules. Please check the documentation.
qml: push (file:///usr/lib/x86_64-linux-gnu/qt6/qml/org/kde/kirigami/PageRow.qml:223)
onActiveSubCategoryRowChanged (qrc:/qt/qml/org/kde/systemsettings/SubCategoryPage.qml:180)
expression for onClicked (qrc:/qt/qml/org/kde/systemsettings/CategoriesPage.qml:181)
qrc:/qt/qml/org/kde/kcmutils/PluginSelector.qml:52:5: QML OverlaySheet: Binding loop detected for property "implicitHeight":
file:///usr/lib/x86_64-linux-gnu/qt6/qml/org/kde/kirigami/templates/OverlaySheet.qml:132:5
qrc:/qt/qml/org/kde/kcmutils/PluginSelector.qml:52:5: QML OverlaySheet: Binding loop detected for property "y":
file:///usr/lib/x86_64-linux-gnu/qt6/qml/org/kde/kirigami/templates/OverlaySheet.qml:110:5
qrc:/qt/qml/org/kde/kcmutils/PluginSelector.qml:52:5: QML OverlaySheet: Binding loop detected for property "implicitHeight":
file:///usr/lib/x86_64-linux-gnu/qt6/qml/org/kde/kirigami/templates/OverlaySheet.qml:132:5
qml: Page SubCategoryPage_QMLTYPE_112(0x55a22a4cfef0) is already in the PageRow
qml: Pushed pages do not conform to the rules. Please check the documentation.
qml: push (file:///usr/lib/x86_64-linux-gnu/qt6/qml/org/kde/kirigami/PageRow.qml:223)
onActiveSubCategoryRowChanged (qrc:/qt/qml/org/kde/systemsettings/SubCategoryPage.qml:180)
expression for onClicked (qrc:/qt/qml/org/kde/systemsettings/SubCategoryPage.qml:210)
kf.newstuff.quick.private: You have not set a transientParent on KNewStuff.Dialog or .Action. This may cause severe problems with window and lifetime management. We'll try to fix the situation automatically but you should really provide an explicit transientParent
kf.newstuff.core: "Network unreachable"

The network is, in fact, reachable, otherwise I wouldn't be able to post this report!