phibsd cannot authenticate usernames involving umlauts or special chars in the display name

Some of your users cannot authenticate via phibsd (MSAD, LDAP) although everything seems to be configured correctly.

The phibsd is not able to authenticate users whose "Display Name" and "CN Name" in MSAD or LDAP contains special chars. Also the char "blank" is not supported in the "CN Name".

Example:
Username: john!.doe
Display Name: John! Doe 

CN Name: CN=John! Doe

Change the Display Name of the users concerned in MSAD/LDAP.

Note:

If you uses legacy netfence firewall release 4.2.3 or lower, also umlauts (ä, ö, ü) are not supported for "Display Name" and "CN Name".