Draytek Vigor2860 User Manual page 548

VPN Remote Dial-in User profiles can be extended to the User profiles in User
Management for authentication.
There are two different behaviors when a User Management account and a VPN profile
share the same Username:
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
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If SSL Tunnel or SSL Web Proxy is enabled in the VPN profile, the user profile in
User Management will always be invalid for Web authentication. For example, if
you create a user profile in User Management with chaochen/test as
username/password, while a VPN Remote Dial-in user profile with the same
username "chaochen" but a different password "1234", you will always get error
message The username or password you entered is incorrect when you use
chaochen/test via Web to do authentication.
If SSL Tunnel or SSL Web Proxy is disabled in the VPN profile, a User
Management account and a remote dial-in VPN profile can use the same
Username, even with different passwords. However, we recommend you to use
different usernames for different user profiles in User Management and VPN
profiles.
Vigor2860 Series User's Guide