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404 error when logging in #850

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Closed
404 error when logging in#850
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bugSomething isn't working

Description

@benthomas-carsales
benthomas-carsales
opened on Sep 10, 2026

Describe the bug
I can't sign in with my Apple ID. The UI shows a 404 error.

The bug is reproducible on multiple Macs.

It appears that the app is sending this request:
curl -H "Host: appstoreconnect.apple.com" -H "accept: /" -H "user-agent: Xcodes/40 CFNetwork/3860.700.1 Darwin/25.6.0" -H "priority: u=3" -H "accept-language: en-AU,en;q=0.9" "https://appstoreconnect.apple.com/olympus/v1/app/config?hostname=itunesconnect.apple.com"

And the response is:

:status: 404
server: daiquiri/5
content-type: text/html;charset=iso-8859-1
content-length: 423
x-apple-jingle-correlation-key: PXHDW3KFKQMATY7U7J2TFEIUFI
x-apple-request-uuid: 7dce3b6d-4554-1809-e3f4-fa753291142a
b3: 7dce3b6d45541809e3f4fa753291142a-f4f1efe94def0e45
x-b3-traceid: 7dce3b6d45541809e3f4fa753291142a
x-b3-spanid: f4f1efe94def0e45
apple-seq: 0.0
apple-tk: false
apple-originating-system: UnknownOriginatingSystem
x-responding-instance: olympus-rest:20413:mr00p00it-vmolympusrest023:9004:26L37
cache-control: must-revalidate,no-cache,no-store
strict-transport-security: max-age=31536000; includeSubDomains; preload
x-daiquiri-instance: daiquiri:15751002:mr36p00it-hyhk09154801:7987:26RELEASE153:daiquiri-amp-dsce-asc-int-002-mr
x-daiquiri-debug-worker-pid: 32418
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
x-content-type-options: nosniff
x-content-security-policy: script-src 'self' *.apple.com
x-daiquiri-instance: daiquiri:18493001:mr85p00it-hyhk03154801:7987:26RELEASE153:daiquiri-amp-all-shared-ext-001-mr
x-daiquiri-debug-worker-pid: 9679
date: Thu, 10 Sep 2026 23:08:37 GMT

<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"/>
<title>Error 404 Not Found</title>
</head>
<body><h2>HTTP ERROR 404 Not Found</h2>
<table>
<tr><th>URI:</th><td>/v1/app/config</td></tr>
<tr><th>STATUS:</th><td>404</td></tr>
<tr><th>MESSAGE:</th><td>Not Found</td></tr>
<tr><th>SERVLET:</th><td>org.glassfish.jersey.servlet.ServletContainer-429e7914</td></tr>
</table>

</body>
</html>

To Reproduce
Try to log in.

Expected behavior
Log in should succeed.

Screenshots

Image

Version

  • OS: macOS 26.6.2
  • Xcodes: 4.0.5 (40)

Activity

  1. benthomas-carsales
    added
    bugSomething isn't working
    on Sep 10, 2026

  2. sakiyamaK commented on Sep 11, 2026

    @sakiyamaK
    sakiyamaK
    on Sep 11, 2026

    Root cause and a fix: Apple stopped serving olympus/v1/app/config, which
    XcodesLoginKit uses to fetch the X-Apple-Widget-Key. Client.fetchServiceKey has no
    fallback, so the 404 surfaces before any credentials are sent — it is unrelated to account
    or password state.

    The rest of olympus is fine (/olympus/v1/session still returns 401 Unauthenticated),
    and federate, signin/init and signin/complete all still return JSON. Only
    app/config is gone, and changing hostname does not help.

    The same key is still embedded as widgetKey in the Developer portal sign-in page.
    Reading it from there restores sign-in: I built the xcodes CLI with that change, signed
    in with 2FA, and installed Xcode 27.0 RC end to end.

    PR against XcodesLoginKit: XcodesOrg/XcodesLoginKit#5

    Note this affects the GUI app too, since 4.0.5 depends on the same code path.

  3. modeezie commented on Sep 11, 2026

    @modeezie
    modeezie
    on Sep 11, 2026

    Having the same issue. Looking forward to fix release!

  4. KaranocaVe commented on Sep 13, 2026

    @KaranocaVe
    KaranocaVe
    on Sep 13, 2026

    Should release a fix version quickly.
    Completely unavailable now

  5. pauluhn commented on Sep 13, 2026

    @pauluhn
    pauluhn
    on Sep 13, 2026

    XcodesOrg/XcodesLoginKit#6 got merged

  6. NSExceptional commented on Sep 13, 2026

    @NSExceptional
    NSExceptional
    on Sep 13, 2026

    Does XcodesOrg/XcodesLoginKit#6 also fix it not showing Xcode 27 as an available download?

  7. jabou commented on Sep 14, 2026

    @jabou
    jabou
    on Sep 14, 2026

    @NSExceptional I can see Xcode 27 in version 4.0.5. Check if you have the Architecture filter set to "Universal," as Xcode 27 is Apple Silicon only (not Universal). Changing that filter to "Apple Silicon" should show it.

    @sakiyamaK, any ETA on when we can expect a new macOS app update using this fix? Just checking if this will be available before the official release today or should I download that one version from the Apple website 😊

  8. MattKiazyk commented on Sep 14, 2026

    @MattKiazyk
    MattKiazyk
    on Sep 14, 2026
    Contributor

    New releases are out with the 404 fixes.

    Thanks for everyone's patience.

  9. MattKiazyk
    closed this as completedon Sep 14, 2026
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