Problem

Integrator installation fails with error "No route to host". Box has two nic cards on it.

Resolution

If you have two addresses defined in the host file make sure they are not pointed to the same host name otherwise it will confuse to find the correct route and to bind with the IP address.
For example:-
10.238.155.178 hostnameA.mgmt.axway.com hostnameA
10.251.129.199 hostnameA.linux.us.axway.com hostnameA

If you have above declaration in the host file then you can run into the "No route to host" error, to resolve that you need to remove the short hostname from either of the entry.

Another reason could be if ip for the node in the /etc/hosts file is set to 127.0.0.1 with the actual hostname, It seems that on DisconectClientsFromHost stage it tries to disconnect the client from 127.0.0.1 instead of the real ip address.
Changing the ip address in /etc/hosts file from 127.0.0.1 to the real can solve the problem.