I asked Yuriy Taraday, and he explained that keystone keeps all expiry info in the non persistent memcached backend. So it seems that the proper solution will be to fix neutron client to retry 401 responces more that 1 time as it does now
I asked Yuriy Taraday, and he explained that keystone keeps all expiry info in the non persistent memcached backend. So it seems that the proper solution will be to fix neutron client to retry 401 responces more that 1 time as it does now