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.