In the last few days, our Jenkins master has lost the ability to communicate with our Openstack installation. When jenkins tries to create a slave, or reconnect to existing slaves after a Jenkins restart, there is an error:

...
May 09, 2016 9:17:33 AM org.jclouds.logging.jdk.JDKLogger logError
SEVERE: Error parsing input
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_ARRAY at line 1 column 930
	at org.jclouds.json.internal.DeserializationConstructorAndReflectiveTypeAdapterFactory$DeserializeIntoParameterizedConstructor.read(DeserializationConstructorAndReflectiveTypeAdapterFactory.java:181)
...

Complete log file is attached as well as a sample response from Openstack.

Our Openstack engineer has examine the cloud configuration, and has not been able to identify any issues there.

Restarting the service & the host did not clear up the issue. We did not change any Jenkins config, and this was working normally previously.