L2TP tunnels fail to be established between the AR and the PC running Windows 8

The possible cause is that the PC uses Windows 8. You must add \ before the user name when inputting a user name. The correct input mode is \vpn. Otherwise, a domain name is automatically added before the user name. As a result, login authentication fails.
When inputting a user name on PCI, add \ before the user name, for example, \vpn. Then PC1 dialup succeeds.

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