Login to the OpenSSO Console as amadmin.
Click Access Control, realm-name, Agents, and then the profile name for the IIS 6.0 agent.
Click Advanced.
Scroll down to Custom Properties and add the com.sun.identity.agents.config.postdata.preserve.lbcookie property. For example:
com.sun.identity.agents.config.postdata.preserve.lbcookie = palbcookie=01
Click Save.