rustup could not choose a version of rustc to run, because one wasn't specified explicitly, and no default is configured

[debski-patrick]

Verification

• I searched for recent similar issues at https://github.com/rust-lang/rustup/issues?q=is%3Aissue+is%3Aopen%2Cclosed and found no duplicates.
• I am on the latest version of Rustup according to https://github.com/rust-lang/rustup/tags and am still able to reproduce my issue.

Problem

I'm currently not able to use either Cargo and Rustc for developing my project. I have Rustup 1.27.1 installed on my local machine. I tried to set environment variables and reinstalling it, and restarting the machine, but didn't find the solutions at all. Sharing a screenshot of my CLI as a proof. Please help me to resolve this issue ASAP.

Steps

1. Download a installation version (rustup-init.exe) from the official Rust website
2. Run the setup application
3. Verify the installation (rustc --version)

Possible Solution(s)

No response

Notes

No response

Rustup version

1.27.1

Installed toolchains

Default host: x86_64-pc-windows-msvc
rustup home:  C:\Users\AzureSphere\.rustup

OS version

Windows 11 24H2

[ChrisDenton]

It seems like rustup install stable exited prematurely. Maybe it was killed by some security software?

Try doing rustup install stable & echo %errorlevel% and seeing if the result is non-zero.

[debski-patrick]

I'm getting "1" as a result. What should I do for now?

[ChrisDenton]

Yeah, that means it's failing unexpectedly which likely means the process is being killed.

Do you know what security software you have installed? It's possible you could add an exclusion for rustup.exe.

[debski-patrick]

What is an example of security software you are talking?

[rami3l]

@debski-patrick It looks like another program is killing rustup, possibly an antivirus... If, say, rustup itself is the reason why the return code is 1 (abnormal), then it should have at least emitted a warning/error of some sort.

[debski-patrick]

Here are some of my apps that seem to be related to the security wise:

• AnyDesk.exe
• AnyViewer.exe
• GlassWire 3.4.exe
• Npcap.exe
• PuTTY release 0.79 (64bit)
• VMware Player
• XAMPP

Which one do you think blocks installing Rust among the above?