Sometimes our builds fail with 'No route to host' error. This usually means that a firewall (iptables) on the agent is improperly configured or running when it shouldn't run at all, so the fix is to simply disable iptables on the agent.

However, such agent is visible in grid and is active! And QuickBuild tries to execute build steps on it.

When selecting such agent in a grid view, all tabs (System Attributes, User Attributes etc.) are empty.

Please fix it, QuickBuild should detect situations like that and shouldn't try to execute steps on a broken agent. Even better, QuickBuild should make such agent inactive or unauthorize it.