Unityのプロジェクトを開くとUnity Package Managerでエラーが出る

今日Unityをインストールしました

始めにプロジェクトを生成して開くことはできました。
が、以下の設定をしてUnityを再起動し、プロジェクトを開くと、エラーが出ます

File > Buold Settings > Player Settings > Other Settings > Api Compatility Lavel: .NET 4.x

エラーメッセージ

Could not establish a connection with the Unity Package Manager local server process.
This is most likely due to a proxy or firewall configuration.
[C:/ProgramFiles/Unity/Editor/Data/Resources/PackageManager/Server/Unity Package Manager.exe]
is reachable via HTTP on the IP address 127.0.0.1.

新しいプロジェクトを作成しようとすると、同じエラーが出ます。

試したこと

ファイヤーウォールの設定でUnity Package Manager.exeの送信、受信を許可

環境変数

変数名: HTTP_Proxy
値: 127.0.0.1:8080

変数名: HTTPSProxy
値: 127.0.0.1:8080

・
環境

Windows10 Pro 64bit
Unity 2018.3.9f1

よろしくお願いします。

追記

Unityでプロジェクトを開く際のログです

Initiating legacy licensing module
LICENSE SYSTEM [2019326 16:5:32] Next license update check is after 2019-03-26T03:46:44

Built from '2018.3/release' branch; Version is '2018.3.9f1 (947e1ea5aa8d) revision 9731614'; Using compiler version '191326128'
OS: 'Windows 10  (10.0.0) 64bit' Language: 'ja' Physical Memory: 8094 MB
BatchMode: 0, IsHumanControllingUs: 1, StartBugReporterOnCrash: 1, Is64bit: 1, IsPro: 0
[Package Manager] Server::Start -- Port 61349 was selected

 COMMAND LINE ARGUMENTS:
C:\Program Files\Unity\Editor\Unity.exe
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [27] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #2

[Package Manager] Server::Start -- Port 60385 was selected
[UnityConnectServicesConfig] config is NOT valid, switching to default
[Package Manager] Cannot connect to Unity Package Manager local server
Request timed out while processing request "https://public-cdn.cloud.unity3d.com/config/production", HTTP error code 0
.[UnityConnect] Request timed out.
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [11] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #3

[Package Manager] Server::Start -- Port 50753 was selected
[Package Manager] Cannot connect to Unity Package Manager local server
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [11] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #4

[Package Manager] Server::Start -- Port 55131 was selected
[Package Manager] Cannot connect to Unity Package Manager local server
E:/Unity/cluster/cluster-my project
Using Asset Import Pipeline V1.
Initiating legacy licensing moduleLoading GUID <-> Path mappings...0.003859 seconds
Loading Asset Database...0.036821 seconds
Build target: OSXUniversal found and added!
Build target: WindowsStoreApps found and added!
Build target: Win64 found and added!
Build target: Win found and added!
Build target: LinuxUniversal found and added!
Build target: Linux64 found and added!
Build target: Linux found and added!
Build target: iOS found and added!
Build target: tvOS found and added!
Build target: PS4 found and added!
Build target: XboxOne found and added!
Build target: Android found and added!
Build target: WebGL found and added!
Build target: Switch found and added!
Build target: Lumin found and added!
Build target: PSM found and added!
Build target: PSP2 found and added!
Build target: WiiU found and added!
Build target: Web found and added!
Build target: WebStreamed found and added!
Build target: OSXIntel found and added!
Build target: OSXIntel64 found and added!
Build target: BlackBerry found and added!
Build target: PS3 found and added!
Build target: N3DS found and added!
Build target: WP8 found and added!
Build target: SamsungTV found and added!
Build target: Tizen found and added!
AssetDatabase consistency checks...0.360333 seconds
Refreshing native plugins compatible for Editor in 0.06 ms, found 0 plugins.
Preloading 0 native plugins for Editor in 0.00 ms.
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [10] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #5

[Package Manager] Server::Start -- Port 54996 was selected
[Package Manager] Cannot connect to Unity Package Manager local server
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [11] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #6

[Package Manager] Server::Start -- Port 54998 was selected
[Package Manager] Cannot connect to Unity Package Manager local server
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [10] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #7

[Package Manager] Server::Start -- Port 64534 was selected
[Package Manager] Cannot connect to Unity Package Manager local server
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [10] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #8

[Package Manager] Server::Start -- Port 51493 was selected
[Package Manager] Cannot connect to Unity Package Manager local server
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [10] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #9

[Package Manager] Server::Start -- Port 57503 was selected
[Package Manager] Cannot connect to Unity Package Manager local server
[Package Manager] Could not establish a connection with the Unity Package Manager local server process. This is most likely due to a proxy or firewall configuration. Make sure the process [C:/Program Files/Unity/Editor/Data/Resources/PackageManager/Server/UnityPackageManager.exe] is reachable via HTTP on the IP address 127.0.0.1.