openai/codex · error · io::Error

Unsupported

Unsupported

Error message

Windows proxy connection attribution currently supports IPv4 only

What it means

Error "Windows proxy connection attribution currently supports IPv4 only" thrown in openai/codex.

Source

Thrown at codex-rs/network-proxy/src/windows_tcp_attribution.rs:47

use windows_sys::Win32::Security::TOKEN_QUERY;
use windows_sys::Win32::Security::TokenRestrictedSids;
use windows_sys::Win32::System::Threading::OpenProcess;
use windows_sys::Win32::System::Threading::OpenProcessToken;
use windows_sys::Win32::System::Threading::PROCESS_QUERY_LIMITED_INFORMATION;

/// Returns the restricting SIDs on the process that opened an accepted loopback connection.
///
/// `accepted_local_addr` and `accepted_peer_addr` must come from the accepted server socket. The
/// owning-PID table describes the client side in the opposite direction, so the lookup matches the
/// exact reversed four-tuple.
pub(crate) fn restricting_sids_for_tcp_connection(
    accepted_local_addr: SocketAddr,
    accepted_peer_addr: SocketAddr,
) -> io::Result<Vec<String>> {
    let (SocketAddr::V4(accepted_local_addr), SocketAddr::V4(accepted_peer_addr)) =
        (accepted_local_addr, accepted_peer_addr)
    else {
        return Err(io::Error::new(
            io::ErrorKind::Unsupported,
            "Windows proxy connection attribution currently supports IPv4 only",
        ));
    };

    let process_id = owning_process_id(accepted_local_addr, accepted_peer_addr)?;
    restricting_sids_for_process(process_id)
}

fn owning_process_id(
    accepted_local_addr: SocketAddrV4,
    accepted_peer_addr: SocketAddrV4,
) -> io::Result<u32> {
    let mut byte_len = 0_u32;
    let result = unsafe {
        GetExtendedTcpTable(
            std::ptr::null_mut(),
            &mut byte_len,

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/network-proxy/src/windows_tcp_attribution.rs:47 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/71605929f1e62a95. Report an issue: GitHub.