200分。我的ORACLE8。16安装完毕后。有装了其他软件。再登陆时不成功，显示：凭证检索失败。求解决方案。
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old question
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remove or comment this line in sqlnet.ora:
sql_net.authentication_service=(nts)
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找到并打开sqlnet.ora文件
把SQLNET.AUTHENTICATION_SERVICES= (NTS)这一行注释掉
或改为SQLNET.AUTHENTICATION_SERVICES= (NONE)
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sqlnet.ora在ORACLE_HOME\ORA81\network\admin\sqlnet.ora