Comment 1 for bug 1660209

it looks like a backend issue.

2017.01.27 06:36:14.398 DEBUG [qtp822332371-132] metadata - POST request from instance:7c4b6a64-3eb8-4954-8658-a498fb9e63e3 to http://10.22.229.96:8775/openstack/2013-10-17/password
2017.01.27 06:36:14.409 WARN [qtp822332371-132] HttpChannel - //169.254.169.254/openstack/2013-10-17/password
com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class [B, and MIME media type, application/octet-stream, was not found
        at com.sun.jersey.api.client.RequestWriter.writeRequestEntity(RequestWriter.java:288) ~[midolman.jar:5.6-SNAPSHOT]
        at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:217) ~[midolman.jar:5.6-SNAPSHOT]
        at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:153) ~[midolman.jar:5.6-SNAPSHOT]
        ... 19 common frames omitted
Wrapped by: com.sun.jersey.api.client.ClientHandlerException: com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class [B, and MIME media type, application/octet-stream, was not found
        at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:155) ~[midolman.jar:5.6-SNAPSHOT]
        at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[midolman.jar:5.6-SNAPSHOT]
        at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[midolman.jar:5.6-SNAPSHOT]
        at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[midolman.jar:5.6-SNAPSHOT]
        at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:570) ~[midolman.jar:5.6-SNAPSHOT]
        at org.midonet.midolman.openstack.metadata.NovaMetadataClient$.proxyRequest(NovaMetadataClient.scala:112) ~[midolman.jar:5.6-SNAPSHOT]
        at org.midonet.midolman.openstack.metadata.NovaMetadataClient$.proxyRequest(NovaMetadataClient.scala:78) ~[midolman.jar:5.6-SNAPSHOT]
        at org.midonet.midolman.openstack.metadata.ProxyHandler.handle(ProxyHandler.scala:34) ~[midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119) ~[midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.server.Server.handle(Server.java:517) ~[midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:302) ~[midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:242) [midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:245) [midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95) [midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:75) [midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:213) [midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:147) [midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654) [midolman.jar:5.6-SNAPSHOT]
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572) [midolman.jar:5.6-SNAPSHOT]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]