fix  bugs
fix  bugs

When username has '/', the following error will occur：
[Root cause: Encoding_Error] Encoding_Error: AS Exchange Error: failed to process the AS_REP: [KRB Error: (6) KDC_ERR_C_PRINCIPAL_UNKNOWN Client not found in Kerberos database - CLIENT_NOT_FOUND]
jcmturner/gokrb5