Thanks for the quick response!

It basically works if I do it that way - only a few pitfalls I came across.

If I use a custom model for the page I´m getting this:

So I tried to check the maintenanceService but I can´t access the maintenanceService from the MaintenanceModeMvcController, so I need to add it to every single page.

        public SearchPageController(IGlobalSettings globalSettings, 
            IUmbracoContextAccessor umbracoContextAccessor, 
            ServiceContext services, AppCaches appCaches, 
            IProfilingLogger profilingLogger, 
            UmbracoHelper umbracoHelper, 
            IRuntimeState runtimeState, 
            MaintenanceModeService maintenanceModeService)
        : base(globalSettings, umbracoContextAccessor, services, appCaches, profilingLogger, umbracoHelper, runtimeState, maintenanceModeService)
    {
        this._maintenanceModeService = maintenanceModeService;
    }

    public ActionResult Index(ContentModel<UmbracoModels.Searchpage> model)
    {
        if(_maintenanceModeService.IsInMaintenanceMode)
            return base.Index(model);

So this element fixes the error: if(_maintenanceModeService.IsInMaintenanceMode)

Ideally, the maintenanceService and the runtimeState and IsBackOfficeUserLoggedIn would be protected instead of private in MaintenanceModeMvcController, then I could access them from my controller.

The way it is now, I probably have to duplicate the logic in an additional Controller, that I then put in between my controllers and the MaintenanceModeMvcController.

Not sure if there is a way to cast the model back to it´s original type through reflection.

But overall, it´s a way to go.

Got everything to work on my local machine, now we tried to deploy to webserver - and there I get the same issue as described here:

https://our.umbraco.com/forum/using-umbraco-and-getting-started/102180-maintenance-manager-service-is-not-available

It works locally, it works if I call the site locally on the server, but it doesn´t work if I call it from the website url. Any ideas?

is working on a reply...