Hi @Rui Ornellas Junior The problem is probably the case of your realm name. Realm names MUST be all capital letters according to the widely accepted realm naming convention. The MIT Kerberos library appears to adhere to this convention and tends to generate failures when the convention is not satisfied. On top of this, the case of the realm name MUST match the case of your KDC. If the realm name known to you KDC is lowercase, then you will need to fix the KDC (or Active Directory). Many have tried to get around this case issue with no luck. ... View more