This turned out to be the result of an invalid endpoint configuration for nova in keystone.
Specifically, the endpoint was configured as:
http://10.254.99.99:8774/v2.0
... instead of:
http://10.254.99.99:8774/v2/$(tenant_id)s
This turned out to be the result of an invalid endpoint configuration for nova in keystone.
Specifically, the endpoint was configured as:
http:// 10.254. 99.99:8774/ v2.0
... instead of:
http:// 10.254. 99.99:8774/ v2/$(tenant_ id)s