As mentioned, this error occurred repeatedly in Unity2019 after I had a git code conflict. I only had the opportunity to open it when I first turned on the computer. When I opened it, it would occasionally send an error that did not affect the operation. At other times, it could not be opened at all. No prompts. After checking the task manager, I found that it crashed. Check the Editor.log file (you can search through Everything, the general path is under C:\Users\yourName\AppData\Local\Unity\Editor), and there are three lines in the printed error report.
[LicensingClient] ERROR Failed to connect to local IPC
[Licensing::Module] Failed to connect to channel: LicenseClient-wangyudi
[Licensing::Module] Successfully launched the LicensingClient
First of all, the solution is not there yet! ! ! ! ! Here I only provide my ideas
and solutions. It is simple and crude, just unplug the network cable! ! ! ! I was able to open it after disconnecting from the Internet. It seems that there is a problem with UnityHub's own license certification.
I Googled this problem and found many people making mistakes, but none of them had a fundamental solution. Check the Unity.Licensing.Client.log file (same as above, usually at the upper level of the Editor.log file) and found that it starts up. Go back to find your certificate, but it cannot be found in the default search path, so it will use the legacy method to find it. Finally, you should find the certificate under C:\ProgramData\Unity, which is the location of UnityHub's default certificate.
Continuing to check below, it will connect to the client, but I don’t know why it will disconnect quickly. There is an error message: Unable to release mutex, perhaps it was acquired from a different thread