Fabric SDK初期化エラー grpc: addrConn.resetTransport failed to create client transport: connection error

前提・実現したいこと

Hyperledger FabricでToDoリストアプリを作っています。
Fabric SDKを初期化する時に下記のエラーメッセージが発生しました。

発生している問題・エラーメッセージ

14:23:29.069 [grpc] DEBU :  grpc: addrConn.resetTransport failed to create client transport: connection error: desc = "transport: Error while dialing dial tcp [::1]:7050: getsockopt: connection refused"; Reconnecting to {localhost:7050 <nil>}
Unable to initialize the Fabric SDK: CreateAndJoinChannel return error: CreateChannel returned error

該当のソースコード

config.ymlファイル：

client:
 peers:
  # peer0
  - host: "localhost"
    port: 7051
    eventHost: "localhost"
    eventPort: 7053
    primary: true
    tls:
      # Certificate location absolute path
      certificate: "$GOPATH/src/github.com/mf/chaintodo/todo-service/fixtures/channel/crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/cacerts/org1.example.com-cert.pem"
      serverHostOverride: "peer0.org1.example.com"

 tls:
  enabled: true

 security:
  enabled: true
  hashAlgorithm: "SHA2"
  level: 256

 tcert:
  batch:
    size: 200

 orderer:
  host: "localhost"
  port: 7050
  tls:
    # Certificate location absolute path
    certificate: "$GOPATH/src/github.com/mf/chaintodo/todo-service/fixtures/channel/crypto-config/ordererOrganizations/example.com/orderers/orderer.example.com/cacerts/example.com-cert.pem"
    serverHostOverride: "orderer.example.com"

 logging:
  level: info

 fabricCA:
  tlsEnabled: true
  id: "Org1MSP"
  name: "ca-org1"
  homeDir: "/tmp/"
  mspDir: "msp"
  serverURL: "https://localhost:7054"
  certfiles :
    - "$GOPATH/src/github.com/mf/chaintodo/todo-service/fixtures/tls/fabricca/ca/ca_root.pem"
  client:
   keyfile: "$GOPATH/src/github.com/mf/chaintodo/todo-service/fixtures/tls/fabricca/client/client_client1-key.pem"
   certfile: "$GOPATH/src/github.com/mf/chaintodo/todo-service/fixtures/tls/fabricca/client/client_client1.pem"

 cryptoconfig:
  path: "$GOPATH/src/github.com/mf/chaintodo/todo-service/fixtures/channel/crypto-config"

試したこと

ホストサービスのIPv6を有効化しようと試みたのですが、/etc/docker/daemon.jsonのファイルへのアクセスがわからず、どう手をつけていいのかわからなくなり質問させて頂くことにしました。

補足情報（FW/ツールのバージョンなど）

docker versionの出力結果：

Client:
 Version:	18.03.0-ce
 API version:	1.37
 Go version:	go1.9.4
 Git commit:	0520e24
 Built:	Wed Mar 21 23:06:22 2018
 OS/Arch:	darwin/amd64
 Experimental:	false
 Orchestrator:	swarm

Server:
 Engine:
  Version:	18.03.0-ce
  API version:	1.37 (minimum version 1.12)
  Go version:	go1.9.4
  Git commit:	0520e24
  Built:	Wed Mar 21 23:14:32 2018
  OS/Arch:	linux/amd64
  Experimental:	true

docker infoの出力結果：

Containers: 6
 Running: 2
 Paused: 0
 Stopped: 4
Images: 23
Server Version: 18.03.0-ce
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host ipvlan macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: cfd04396dc68220d1cecbe686a6cc3aa5ce3667c
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: 949e6fa
Security Options:
 seccomp
  Profile: default
Kernel Version: 4.9.87-linuxkit-aufs
Operating System: Docker for Mac
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 1.952GiB
Name: linuxkit-025000000001
ID: 25LU:5DIF:VXIL:RNZI:4N4R:36WH:NCPU:KVAU:UR7E:IEM6:CCMB:VLTW
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
 File Descriptors: 39
 Goroutines: 54
 System Time: 2018-04-13T09:32:49.5804164Z
 EventsListeners: 2
HTTP Proxy: docker.for.mac.http.internal:3128
HTTPS Proxy: docker.for.mac.http.internal:3129
Registry: https://index.docker.io/v1/
Labels:
Experimental: true
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false

docker inspect network hostの出力結果：

[
    {
        "Name": "host",
        "Id": "086cd1a98072322741919f567ba2e454bcb5491973e0ca31bb11f613b5da81f3",
        "Created": "2018-03-22T14:05:13.272024476Z",
        "Scope": "local",
        "Driver": "host",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": []
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {},
        "Options": {},
        "Labels": {}
    }
]

どうぞよろしくお願いいたします。