Can't reach Azure Data Factory

Quyen Dang 41 Reputation points
2026-08-13T10:48:57.2266667+00:00

Hi

I can't reach adf.azure.com. Clearing cache and cookies or changing to a different browser (Firefox, Chrome, Edge) on the same laptop doesn't work. I can still open the browser on my phone and access just fine. What am I missing?

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Azure Data Factory
Azure Data Factory

An Azure service for ingesting, preparing, and transforming data at scale.

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AI answer

2026-08-13T10:49:20.4+00:00

Since the issue happens on the laptop across Firefox, Chrome, and Edge, but works on the phone, this points to a laptop-side network, DNS, proxy, firewall, or cookie setting issue rather than an Azure Data Factory service outage.

Try this in order:

  1. Use an InPrivate/Incognito window.
    • Azure Data Factory Studio can fail to load if third-party cookies are blocked.
    • In Edge, open edge://settings/content/cookies and make sure Allow sites to save and read cookie data is enabled and Block third-party cookies is disabled.
    • If all cookies should not be enabled, add adf.azure.com under Allow.
    • In Chrome, open chrome://settings/cookies, either select Allow all cookies or add adf.azure.com under Sites that can always use cookies.
    • Refresh ADF Studio after the change.
  2. Test direct connectivity from the laptop.
    • In the browser address bar, open adf.azure.com again.
    • If it still times out, open Command Prompt and run an nslookup against the ADF host name.
    • A normal DNS response means DNS is likely working and the next check is local firewall or HTTPS blocking.
  3. If DNS resolves normally, check local network controls.
    • Since the phone works, compare whether the laptop is using a VPN, proxy, security software, or corporate firewall.
    • Local IT should verify that HTTPS connections to the ADF host name are not blocked.
  4. If DNS does not resolve normally, test broader resolution.
    • Run nslookup datafactory.azure.com and nslookup azure.com to see where name resolution fails.
    • If resolution is failing, the issue can be with the DNS server. Changing the DNS server, for example to 8.8.8.8, can work around that.
  5. If the browser can reach the ADF service endpoint and returns 404, that usually indicates the client side is fine and the issue is on the ADF service side.
    • In that case, file a support ticket and include the Activity ID from the error message if one is shown.

Given the screenshot shows ERR_CONNECTION_TIMED_OUT, the strongest next checks are:

  • third-party cookie settings for adf.azure.com
  • VPN/proxy/firewall on the laptop
  • DNS resolution from the laptop with nslookup
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  1. Himaja Y 455 Reputation points Microsoft External Staff Moderator
    2026-08-17T16:34:30.8633333+00:00

    Hi Quyen Dang,

    Since the issue occurs on multiple browsers on the same laptop, while ADF works on the phone, we recommend checking the laptop network, VPN, proxy, DNS, or firewall.

    Please test ADF using a mobile hotspot. If it works, the issue is most likely with the corporate network or VPN. Also, verify that the required Azure endpoints are allowed through the corporate proxy/firewall.

    Microsoft recommends checking network and firewall/proxy configuration for Azure portal connectivity

    Reference:

    https://learn.microsoft.com/en-us/azure/azure-portal/azure-portal-safelist-urls?tabs=public-cloud

    If my answer helped you, please consider marking it as accepted.

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