Ted4/Fred4 may crash on startup because of denied access to volumes.

A typical exception may look like:

TeraDP.GN4.Common.DataException: Invalid URL 'file://gn4test/volumes/fonts/x\0/0/3E55AA6D79D90B5EC10A3760AE2C2D0C_fontFile.ttf': Access to the path '\\gn4test\volumes\fonts\0\0\3E55AA6D79D90B5EC10A3760AE2C2D0C_fontFile.ttf' is denied. (ERR0309)
   at TeraDP.GN4.Client.ClientLogin.GetDataContents(IList`1 dataIds, Int32 maxSize)
   at FontImport.DeployFontsPrimitive(List`1 fonts, String& message, Boolean consoleOutput, EditorialLogin login)
   at FontImport.DeployFonts(IntPtr windoHandle, Boolean consoleOutput, EditorialLogin login)
   at TeraDP.GN4.Fred4.Fred4App.LoadConfigOverride(DataConnection dataConnection)
   at TeraDP.GN4.WinUI.ApplicationBase.LoadUserConfigsBase(DataConnection dc, Boolean Startup)

Check which account is used by the application pool of the GN4 application and if the account has access to the specified volume.

Eventually you can specify an appropriate username and password directly in the volume's configuration by means on srv4 volumes: see Set credentials for a volume.

Note

If no exception gets displayed, but Ted4/Fred4 just silently close, enable exceptions display as explained in Enable exceptions display and logging for GN4 applications.