It is impossible to connect to the Runtime from a Designer, but the Runtime process seems to be running.

The Runtime logs contain an error "java.rmi.NoSuchObjectException: no such object in table".

java.rmi.NoSuchObjectException: no such object in table
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(
    at sun.rmi.transport.StreamRemoteCall.executeCall(
    at sun.rmi.server.UnicastRef.invoke(
    at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(
    at $Proxy1.executeDelivery(Unknown Source)
    at org.quartz.simpl.SimpleThreadPool$



This can happen when there was some network failure which caused the Runtime to partially stop. This can also happen after the Runtime's host machine went to sleep.

The best way to recover from this case is to stop and restart the Runtime.

To avoid this in the future, make sure that the Runtime's host machine never goes to sleep.