Help! Can't access Admin/Plugins anymore - Getting The remote server returned an error: (503)

Hi,

Yesterday I started having problems with our website.... All of a sudden we are unable to access Admin/Plugins, it just get an error website...

If I look at our logs I get the following info:
---
Short message  
The remote server returned an error: (503) Service Temporarily Unavailable.
Full message  
System.Net.WebException: The remote server returned an error: (503) Service Temporarily Unavailable.
   at System.Net.HttpWebRequest.GetResponse()
   at Nop.Core.Plugins.OfficialFeedManager.GetDocument(String feedQuery, Object[] args) in C:\andrei\nopcommerce\sources\src\Libraries\Nop.Core\Plugins\OfficialFeedManager.cs:line 25
   at Nop.Core.Plugins.OfficialFeedManager.GetVersions() in C:\andrei\nopcommerce\sources\src\Libraries\Nop.Core\Plugins\OfficialFeedManager.cs:line 70
   at Nop.Web.Areas.Admin.Factories.PluginModelFactory.PrepareOfficialFeedPluginSearchModel(OfficialFeedPluginSearchModel searchModel) in C:\andrei\nopcommerce\sources\src\Presentation\Nop.Web\Areas\Admin\Factories\PluginModelFactory.cs:line 249
   at Nop.Web.Areas.Admin.Factories.PluginModelFactory.PreparePluginsConfigurationModel(PluginsConfigurationModel pluginsConfigurationModel) in C:\andrei\nopcommerce\sources\src\Presentation\Nop.Web\Areas\Admin\Factories\PluginModelFactory.cs:line 357
   at Nop.Web.Areas.Admin.Controllers.PluginController.List() in C:\andrei\nopcommerce\sources\src\Presentation\Nop.Web\Areas\Admin\Controllers\PluginController.cs:line 111
   at lambda_method(Closure , Object , Object[] )
   at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
   at StackExchange.Profiling.MiniProfilerMiddleware.Invoke(HttpContext context) in C:\projects\dotnet\src\MiniProfiler.AspNetCore\MiniProfilerMiddleware.cs:line 94
   at Nop.Services.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) in C:\andrei\nopcommerce\sources\src\Libraries\Nop.Services\Authentication\AuthenticationMiddleware.cs:line 79
   at FoxNetSoft.Plugin.Misc.RedirectManager.Infrastructure.PageManagerMiddleware.Invoke(HttpContext context, IWebHelper webHelper, IWorkContext workContext, IStoreContext storeContext, RedirectManagerSettings redirectManagerSettings)
   at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Nop.Core.Http.InstallUrlMiddleware.Invoke(HttpContext context, IWebHelper webHelper) in C:\andrei\nopcommerce\sources\src\Libraries\Nop.Core\Http\InstallUrlMiddleware.cs:line 51
   at Nop.Core.Http.KeepAliveMiddleware.Invoke(HttpContext context, IWebHelper webHelper) in C:\andrei\nopcommerce\sources\src\Libraries\Nop.Core\Http\KeepAliveMiddleware.cs:line 50
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.Invoke(HttpContext context)
---

All help is very much appreciated!!

Probaly the same problem as this
https://www.nopcommerce.com/boards/topic/74486/visual-studio-2019-164-nop-420
and this
https://www.nopcommerce.com/boards/topic/74466/version-41-cloudfare-blocks-the-request-to-the-feedmanager-in-nopcommerce-41-making-the-plugin-listi

Yidna wrote:

You are a lifesaver! Thank you for the reply, this is definitely the problem.

Kudos to you!