When installing OpenShift V3 Origin using ansible I'm getting the following error on the master:
Jul 02 01:53:09 localhost openshift-master: F0702 01:53:09.390639 9141 start_master.go:99] could not reach etcd: 501: All the given peers are not reachable (failed to propose on members [https://:4001] twice [last error: Get https://:4001/v2/keys/?quorum=false&recursive=false&sorted=false: tls: either ServerName or InsecureSkipVerify must be specified in the tls.Config]) 
The server name is missing obviously. But why? I can do a 'ping master' or 'nslookup master' without any problems.