Failed to start the Unity Package Manager local server process.

When I try opening or creating a project, through both Unity Hub and normal Unity, this error pops up:

Failed to start the Unity Package Manager local server process. Make sure the process [C:/Program Files/Unity/Editor/Data/Resources/PackageManager/Server/UnityPackageManager.exe] is not blocked by your anti-virus configuration.

I don’t know what I should do, as there are only a few threads on the internet about this issue, and NONE has an actual answer. I reported this as a bug, but I got no response. How do I fix this error?

135711-unityissue.png

TLDR: Reinstall unity and verify that the platform icons (see below) show up.

Hello, I experienced the same error. I thought that this was related to some form of network related issue, which was not the case.
I had to reinstall the respective version of Unity and now it works, because apparently my installation was broken. Before reinstalling, the icons I highlighted below didn’t show up. Now they do and it works.
Not sure if this is related at all, I thought I’d share anyway.

Really, no answers?

I’m now running into the same problem on my Mac with Unity 2019.3.0f6 and can’t find any solutions.

I have this problem too. Maybe after more time you found answer to this question?

In the end, I found the problem: Unity wasn’t allowed through the firewall. I went to Windows Firewall with Advanced Security from the Control Panel and there I made sure both Unity and UnityPackageManager are checked for both inbound and outbound rules (this solved it!). I also went to “Allow a program through Windows Firewall” and checked all the boxes in front of Unity and UnityPackageManager.


















Don’t forget to also check the boxes for Package Manager.

@JayJennings @isakovsanya56 ·

This is how I get around this problem

  1. Install the Unity 2017.4.40of1 (LTS)
  2. Open it and create new project
  3. Once it opens Close it and open the unity hub, the project should be there.
  4. Change Unity Version to the version you need, in my case I want the latest release 2019.3.14of1
  5. Follow the steps to convert and that’s that.

hope it works for at least some of you guys!

ENG:
Log into your Unity Hub account. Make sure the Unity Hub license is active. Next, open the directory “Unity \ Hub \ Editor \ 2020.1.0f1 \ Editor \ Data \ Resources \ PackageManager \ Server” then delete the file: unity_license.json. After we restart the computer, and open Unity. The license is restored from the Unity Hub, and this error will no longer appear. I’m afraid to assume that this is due to damage to the license that is on your PC.
-=-=-=-=-=-
RU:
Войдите в свою учетную запись Unity Hub. Убедитесь, что лицензия Unity Hub активна. Затем откройте каталог «Unity \ Hub \ Editor \ 2020.1.0f1 \ Editor \ Data \ Resources \ PackageManager \ Server», затем удалите файл: unity_license.json. После перезагружаем компьютер и открываем Unity. Лицензия восстанавливается из Unity Hub, и эта ошибка больше не будет появляться. Боюсь предположить, что это связано с повреждением лицензии, которая находится на вашем ПК.

I tried the the accepted solution but that didn’t work for me. Instead what worked was installing an older version of Unity for example 2019.4.31, opening the project, then close it and open it with the new version.

With 2days of trial I solved it.

my editor(2020.3.9) was in my personal folder,

I found it should be in

C:\Program Files\Unity\Hub\Editor

folder.

Check if path of unity editor is in right place.