I am testing the WLAN functionalities of a device connecting to a RADIUS server. This RADIUS server is located on a Raspberry Pi with Raspbian Stretch and is using FreeRADIUS 3.0 and Hostapd. For EAP-PEAP MSCHAPv2 the device should be able to handle usernames and passwords with special characters like:

  • German umlauts
  • Cyrillic letters
  • Chinese characters

and so on...

Now I ask myself:

What characters are allowed to use for the usernames and passwords defined in the authorize file of FreeRADIUS 3.0?


Radius strings may be any valid UTF8 sequence. There's no limitations on what characters can be used for a user's password or for their username.

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