ora-12631:用户名检索失败
解决方案：
These errors are associated with remote authentication on NT under NTS (NT Transport Services). Essentially, the following parameter is set in the "sqlnet.ora":
SQLNET.AUTHENTICATION_SERVICES = (NTS)
As a result, if you are logged on as a domain user, and you don't have a network connection (network cable temporary removed or laptop booted standalone), you will not be able to connect to the database because the authentication will try to reach the domain users database on the PDC (Primary Domain Controller) or BDC (Backup Domain Controller).
Solution Description:
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There a 2 solutions to connect to the database when no network is present:
1. You can log in as a NT local user.
2. You can disable NTS in sqlnet.ora by setting the following parameter:
SQLNET.AUTHENTICATION_SERVICES = (NONE)
通过使用NONE，成功解决此问题。
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