Authentication Doesn't Work with Load Balancer

The Windows Desktop SSO Authentication module worked fine. Then it stopped working after the OpenSSO Enterprise server was configured as a server in a site configuration with a load balancer. .

The following message trace is displayed in the server-side debug log amAuthWindowsDesktopSSO:

......
02 a6 ff 1d 1c 3c e2 dc d4 89 66 b0 70 dd 6b b0
c1 a4 69 bd 29 29 54 05 04 e8 75
06/25/2007 09:13:56:559 AM PDT: Thread[service-j2ee,5,main]
In authenticationToken ...
06/25/2007 09:13:56:561 AM PDT: Thread[service-j2ee,5,main]
Context created.
06/25/2007 09:13:56:565 AM PDT: Thread[service-j2ee,5,main]
Authentication failed with GSSException.

You will also see a bigger Kerberos token than a normal token. Be sure the defined principal for the OpenSSO Enterprise server has load balancer fully-qualified domain name (FQDN). Example: HTTP/amlb. openSSOhost.example.com.