PLANET CS-2001 - Manual (Page 190)

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Step 18. Click
on the Edit Profile… button then click on the Authentication
tab. Tick Microsoft Encrypted Authentication version 2 (MS-CHAP v2),
Microsoft Encrypted Authentication (MS-CHAP ), Encrypted
authentication (CHAP) and Unencrypted authentication [PAP, SPAP].
（Figure 8-26）
Figure 8-26 Configuring the Authentication Settings