Symptoms
'K2:[DOMAIN]System.Byte[]' is returned when trying to get users. Other users gets disabled whereas [DOMAIN]System.Byte[] is the only user enabled in the Identity.Identity table.
Diagnoses
This issue stems from LDAP/AD wherein it is not able to recognize the correct type and falls back to a default schema, thus returning a System.Byte[]: https://social.msdn.microsoft.com/Forums/vstudio/de-DE/d304b243-0521-476a-baa1-ce1b4ef3ab2a/directoryservices-adsi-fails-to-cache-schema-from-openldap-on-windows-8?forum=vbgeneral https://support.microsoft.com/en-us/kb/2802148
Resolution
A coldfix was provided for 4.6.11. Kindly contact K2 support to request for this code fix should you encounter the same issue.