SDL Web 8.5: Access to the path denied when adding a Custom Page

Question

I try to create a new Custom Page and got below error. Steps mentioned below for replicating the issue.

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share) at Tridion.Web.UI.Models.CME.General.SaveCustomPages(XmlReader reader) at Tridion.Web.UI.Models.CME.General.SaveNewCustomPage(String xml) at Tridion.Web.UI.Models.CME.General.SaveNewCustomPage(String xml, Boolean doneEditing) at SyncInvokeSaveNewCustomPage(Object , Object[] , Object[] ) at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at Tridion.Web.UI.Core.Extensibility.DataExtenderOperationInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

Procedure

1. Open Content Manager Explorer.
2. In the Shortcuts Navigation pane, select the Custom Pages node.
3. Open the Ribbon Toolbar Create tab and click New Custom Page. The New Custom Page window opens.
4. Fill in or modify the following fields:
   • Name - the name of the Custom Page.
   • URL - the URL of the Page.
   • Default - (optional) select if you want to set this Page as the splash screen for all Users that access the Content Manager.
5. Click Save and Close.
6. Access to the path D:\tridion\web\WebUI\Editors\CME\Preferences\CustomPages.xml is denied.

Looking for solution and suggestion to solve this issue.

Answer 1

Check file permission on the Preference folder and custompages.xml

Ensure Network Service account has read/write to Preference folder and full control on custompages.xml