~/Sources/mongo/mongod --sslMode requireSSL --sslPEMKeyFile tests/x509gen/altname.pem --sslCAFile tests/x509gen/ca.pem --dbpath /data/rs1 --replSet foo 

~/Sources/mongo/mongo --ssl --sslCAFile tests/x509gen/ca.pem --host localhost --sslPEMKeyFile tests/x509gen/client.pem 
MongoDB shell version: 3.3.8-545-g4d826ac
connecting to: localhost:27017/test
MongoDB server version: 3.3.8-545-g4d826ac
Server has startup warnings: 

> rs.initiate()
{
	"info2" : "no configuration specified. Using a default configuration for the set",
	"me" : "infant:27017",
	"ok" : 0,
	"errmsg" : "No host described in new configuration 1 for replica set foo maps to this node",
	"code" : 93
}

2016-07-18T13:07:38.611-0700 I COMMAND  [conn2] initiate : no configuration specified. Using a default configuration for the set
2016-07-18T13:07:38.611-0700 I COMMAND  [conn2] created this configuration for initiation : { _id: "foo", version: 1, members: [ { _id: 0, host: "infant:27017" } ] }
2016-07-18T13:07:38.611-0700 I REPL     [conn2] replSetInitiate admin command received from client
2016-07-18T13:07:38.612-0700 I NETWORK  [thread1] connection accepted from 127.0.0.1:34930 #5 (3 connections now open)
2016-07-18T13:07:38.620-0700 E NETWORK  [conn5] SSL peer certificate validation failed: unsupported certificate purpose
2016-07-18T13:07:38.621-0700 I -        [conn5] AssertionException handling request, closing client connection: 6 Recv failed
2016-07-18T13:07:38.621-0700 E NETWORK  [conn2] The server certificate does not match the host name infant
2016-07-18T13:07:38.621-0700 I -        [conn5] end connection 127.0.0.1:34930 (2 connections now open)
2016-07-18T13:07:38.621-0700 W NETWORK  [conn2] couldn't check isSelf (infant:27017) socket exception [CONNECT_ERROR] for The server certificate does not match the host name infant
2016-07-18T13:07:38.621-0700 E REPL     [conn2] replSet initiate got NodeNotFound: No host described in new configuration 1 for replica set foo maps to this node while validating { _id: "foo", version: 1, members: [ { _id: 0, host: "infant:27017" } ] }