Oracle's ora-12638 Error resolution: Identity retrieval failed

ora-12638: Identity retrieval failed. With Sql:select * from T@zjdtdblink. Workaround:

Look at the Dtdblink data link in the Dbastudio, not active. Look at the domain server. The problem is resolved after restarting the domain server. Check online and make a further explanation:

Cause: Credential retrieval failed due to Oracle's inability to apply OS authentication

Action

1. Open Network/admin under Sqlnet.ora modify Sqlnet.authentication _services= (NONE).

2. Start NET8 configuration assistant--> select the third local network service name configuration--> Delete ... (delete the original local network service name)

3. Repeat step Two--> Add. (new local network service name)

4.

Restart Oracle---------------------------------------------------------------

NTS is the Winnt authentication method---------------------------------------------------------------

In Sqlnet.ora, #sqlnet. Authentication_services = (TCP) is changed to

#sqlnet. Authentication_services = (NONE) or comment out this line-------------------------------

Sqlnet.authentication_services = (NONE)