Oracle SQL Developer: Using 'Windows Authentication' To Connect to SQL Server (Fixing SSO Failed Error)

The purpose of this post is to help you solve the an error message which prevents you using "Windows Authentication" to connect to SQL Server databases within Oracle SQL Developer.

The error message you get is;

Status: Failure - I/O Error: SSO Failed: Native SSPI library not loaded. Check the java.library.path system property.

Which is nicely displayed at the bottom of the "New/ Select Database Connect" dialog when you're trying to connect to your SQL Server instance;

Oracle SQL Developer: Windows Authentication Error

Now you're seeing this error because the system can't locate one of the required .dll's it needs to order for SSO to work.

This .dll is included in the installation (which includes the JRE and the SQL Server plugin). If you do a search in the directory;

SQL Developer Install Directory

For the file ntlmauth.dll and then copy it into the root (the same as the sqldeveloper.exe application) and then shutdown and restart you'll find that this will have fixed the connection issue.

Copying to to the root directory will allow the application to work without having to install anything on the machine it's running on (as opposed to altering the path or copying to file to somewhere else that's already on the path).