MCR returns 403 when accessed from GH codespaces

[petrroll]

Hi, when trying to get images or just even curl https://mcr.microsoft.com/v2/ from within a github codespace, I get 403.

curl -4 -I "https://mcr.microsoft.com/v2/" 2>&1
HTTP/2 403 
x-msedge-ref: Ref A: 72531C3C7FC44D1BB11E7D0511FE3E3E Ref B: AMS231020512029 Ref C: 2026-02-01T11:07:55Z
date: Sun, 01 Feb 2026 11:07:55 GMT

Locally the access works normally, it seems that MCR is blocking that IP range (azure VMs).

E.g. docker hub is normally accessible.

[pjohnmeyer]

Had a similar failure today from a Docker build on GitHub actions, so it may be a "GitHub-infra" general issue? But it is intermittent; it doesn't always happen.

failed to solve: mcr.microsoft.com/playwright:v1.58.2-noble: failed to resolve source metadata for
mcr.microsoft.com/playwright:v1.58.2-noble: unexpected status from HEAD request to
https://mcr.microsoft.com/v2/playwright/manifests/v1.58.2-noble: 403 Forbidden