castor.integration.eqiad.wmflabs is no more reachable by SSH. Puppet has not been running for the last 10 days. It did not receive the new Puppet CA, that causes LDAP to fail:
2017-07-20T07:48:13.225792+00:00 castor nslcd: [d89a32] <group/member="puppet"> no available LDAP server found: Server is unavailable [09:48:58] <hashar> failed to bind to LDAP server ldap://ldap-labs.eqiad.wikimedia.org:389: Connect error: (unknown error code)
salt is broken as well, hence the instance is unreachable.