This is really strange. Have you tried restarting all the servers? The web farm servers checker, in fact a specific aspx page within the project which is pinged every 20 seconds. If there is no response on the ping, server goes to Transitioning state for 3 minutes. Within these 3 minutes, if the ping is still failing, server goes to Not responding state or if the ping starts answering, servers goes to Healthy state. So, it is strange you have the transitioning state for such a long time. There must have been some "freeze" somewhere.