Solved. web agent 3.0.4 not support conditional login url.
for web agent 3.1 the key is: com.forgerock.agents.conditional.login.url
and for j2ee agent 3.1 the key is com.sun.identity.agents.config.conditional.login.url
and due to I use virtual server, I need configure fqdn mapping: com.sun.identity.agents.config.fqdn.mapping[branda.com] = branda.com