The Oracle JDBC driver does not accept a forwardable Kerberos ticket (TGT). If you try to use a TGT, you will encounter an exception. To work around this issue, disable Kerberos (set "forwardable = false" in the krb5.conf/krb5.ini file on both Linux and Windows). Note that this will work only for static kerberos authentication. Teiid's pass-through authentication will fail as it depends on forwardable tickets.