Arduino IDE is stuck on loading

[zhekch]

Describe the problem

Today when I tried to open Arduino, it opened, but didn't show anything. MacOS menubar shows arduino ide as a focused app, but nothing is happening, I can't create a new project, cant open the recent ones. I also tried opening a random project on my computer, but then only the white screen is shown, and nothing else. Here is the image showing it.

Reinstalling IDE, restarting MacOS, deleting all arduino config files didn't work either.
The logs show me this:

2022-11-25 18:27:24 root ERROR Failed to start the backend application:
2022-11-25 18:27:24 root ERROR Error: getaddrinfo ENOTFOUND localhost
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:71:26)
2022-11-25 18:27:24 root ERROR Uncaught Exception: 
2022-11-25 18:27:24 root ERROR Error: getaddrinfo ENOTFOUND localhost
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:71:26)

Found the same problem in #1527, but it doesn't contain the fix for the problem.

To reproduce

I dont know how it happened, the application just randomly stopped working.

Expected behavior

I was expecting the application to load as normal.

Arduino IDE version

2.0.0 - 2.0.3

Operating system

macOS

Operating system version

Big Sur 11.7.1

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details

[per1234]

Hi @Zhek1ch. Thanks for your report. Just in case they might provide some additional relevant information, please provide the complete logs.

[zhekch]

2022-11-26_log.log
Here is the full log

[per1234]

Thanks. I see you did a good job of extracting all the relevant lines to include in your original report, but I had to check to be sure.

Did you modify the /private/etc/hosts (AKA /etc/hosts) file recently?

[zhekch]

No, the only thing I did was resetting the nvram, and after this some applications started glitching, and sadly arduino is one of them

[kittaakos]

@Zhek1ch, please help us to narrow down the problem. IDE2 builds on the Theia IDE. From the logs, it seems the problem is with pure Theia. Could you please get the latest Theia Blueprint version from https://theia-ide.org/docs/blueprint_download, start it and let us know if the app loads or not?

It's a guess, but handling IPv6 addresses in Theia might have flaws. Thank you!

[zhekch]

No, Theia IDE doesn't load either

The application is active, but I can't do anything.
Theia log folder seems to be empty.

[zhekch]

Binding localhost to 127.0.0.1 fixed the problem -- Tutorial
Apparently file /etc/hosts was somehow modified by system(maybe because of the nvram reset), and localhost bind was somehow removed.