连接Oracle报错 ORA-12638: 身份证明检索失败

问题

连接Oracle数据库时报错：ORA-12638: 身份证明检索失败

C:Users***>sqlplus scott/tiger@192.168.56.103:1521/orcl
SQL*Plus: Release 10.2.0.1.0 - Production on 星期二 1月 8 09:13:18 2019
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
ERROR:
ORA-12638: 身份证明检索失败

解决

将oracle安装路径oracleproduct10.2.0db_1NETWORKADMINsqlnet.ora 文件修改一下

把文件中的：
SQLNET.AUTHENTICATION_SERVICES= (NTS)
修改为：
SQLNET.AUTHENTICATION_SERVICES= (BEQ,NONE)

修改前：

# sqlnet.ora Network Configuration File: C:oracleproduct10.2.0db_1
etworkadminsqlnet.ora
# Generated by Oracle configuration tools.

# This file is actually generated by netca. But if customers choose to 
# install "Software Only", this file wont exist and without the native 
# authentication, they will not be able to connect to the database on NT.

SQLNET.AUTHENTICATION_SERVICES= (NTS)

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

修改后：

# sqlnet.ora Network Configuration File: C:oracleproduct10.2.0db_1
etworkadminsqlnet.ora
# Generated by Oracle configuration tools.

# This file is actually generated by netca. But if customers choose to 
# install "Software Only", this file wont exist and without the native 
# authentication, they will not be able to connect to the database on NT.

SQLNET.AUTHENTICATION_SERVICES= (BEQ,NONE)

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)