403 Forbidden when accessing ecmwf.int

Hello ECMWF Team,

I would like to report an issue accessing the ECMWF website from my institutional network.

When accessing https://www.ecmwf.int, the website consistently returns 403 Forbidden (nginx).
However, access works normally when using a mobile 4G/5G network, which suggests that the issue is related to the public IP of our institutional network.

What I have already checked:

  • IP and DNS are set to Automatic (DHCP)

  • Tried different browsers and cleared cache/cookies

  • Disabled VPN

  • Restarted the machine

  • Verified that access works immediately via mobile hotspot (4G)

  • Could you please advise:

    • Whether there are IP-based restrictions or blocks currently applied to certain institutional networks

    • If there is a recommended way to request a review or whitelist for web access

    • Or if there is an alternative recommended access route for the ECMWF website from such networks

    Thank you very much for your time and support.

    Best regards,