If you are using Load Balancer with IP security (IPsec) enabled, output packets might be incorrect and dispatcher configuration information might display incorrectly in the command line interface and administrative console for Windows Application Server. Load Balancer reports that it is forwarding connections, but clients do not receive responses.
If you are using Load Balancer function and IP security on the same host, there might be communication problems between Load Balancer and the application server. The Load Balancer component is not fully compatible with IPsec features and it transmits data from both sides of the security layer. Load Balancer receives packets below IPsec and, as a result, receives encrypted packets that it does not decrypt. When sending data, Load Balancer transmits them above IPsec, so it sends unencrypted packets to the application server that are encrypted on the other end by IPsec. The application server, therefore, receives encrypted data that cannot be used.