Comment 2 for bug 2024372

Was this failure on a local/devstack environment?

It looks like this piece of code is in the path where the failure occurred:

https://github.com/openstack/manila/blob/c976f041ddb936af113d0e36f9b6bf2e0c496246/manila/share/drivers/service_instance.py#L538-L540

Can you try to use the glance user's credentials directly and perform the list images call that the driver's doing?