Symptoms

The custom authenticator fails to log the user in.

Cause

In the custom authenticator code uses the Request.getRemoteUser() method.

There is a bug in the bundled Seraph package which causes Request.getRemoteUser() to return null when called (even though the user has been successfully authenticated).

Resolution

1. Backup up the file <confluence-install>\confluence\WEB-INF\lib\atlassian-seraph-2.3.3.jar
2. Replace it with the file in atlassian-seraph-2.3.3-patched.jar
3. Restart Confluence