I can enter all information about my cloud, and it tests ok and accepts it. When I go to launch a new slave though, I get the following snippet:
Stack trace

javax.servlet.ServletException: java.lang.RuntimeException: org.jclouds.compute.RunNodesException: error running 1 node group(jenkins-slave) location(regionOne) image(cdaa7dff-8bf6-4dc7-a84a-2802e23c0c94) size(1) options({loginPrivateKeyPresent=true, scriptPresent=true, userMetadata=

, userData=[B@4a0d6539})
Execution failures:

1) ExecutionException on jenkins-slave-b77:
java.util.concurrent.ExecutionException: org.jclouds.http.HttpResponseException: command: POST http://130.20.232.220:8774/v2/84ad49ccecf2478b9317b332c1490bd4/servers HTTP/1.1 failed with response: HTTP/1.1 400 null; content: [{"badRequest": {"message": "Multiple possible networks found, use a Network ID to be more specific.", "code": 400}}]
at com.google.common.util.concurrent.AbstractFuture$Sync.getValue(AbstractFuture.java:306)
at com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:293)
at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116)
at org.jclouds.concurrent.FutureIterables$1.run(FutureIterables.java:125)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.jclouds.http.HttpResponseException: command: POST http://130.20.232.220:8774/v2/84ad49ccecf2478b9317b332c1490bd4/servers HTTP/1.1 failed with response: HTTP/1.1 400 null; content: [{"badRequest": {"message": "Multiple possible networks found, use a Network ID to be more specific.", "code": 400}}]
...

There seems to be no way to specify a network_id, which is important to our setup.