Hello
In the Windows environment, the "guest" account is used by default to connect with the Synology NAS. To avoid automatic login as a "guest", create an account on the Synology NAS that is exactly the same as the Windows computer username.
The specific operation steps are as follows:
1.Click Start in the lower-left corner of the screen, open the Run command, Enter cmd
2.Enter on the command line set
3.Look for the "USERNAME" field
4.On Synology NAS, go to Control Panel > Users and Groups
5.Create a new account with exactly the same Windows PC username
6.Specify the same shared folder permissions to this new account
7.Restart the computer. When you access your Synology NAS through a Windows PC, you should no longer see this message.
Best Regards,
Wesley Li