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One of my home IP addresses can't access sites hosted in Azure

Launchbury, Phil 0 Reputation points
2025-04-06T11:21:58.96+00:00

Hi,

I have a slightly odd issue - traffic coming from my default home IP address (82.68.8.222) seems to be being dropped by some websites hosted on Azure (Microsoft learn, Nationwide Building Society). If I masquerade my laptops as coming from a diffierent IP address within my /28, it works fine. I get the following errors:

https://answers.microsoft.com

 The request is blocked.

20250402T135552Z-18568544f9chlv2whC1LONk4ms0000000fk0000000006u49

Nationwide Building Society:

 

Nationwide Building Society Sorry, our link hasn’t worked To try again, please refresh this page. To go directly to our website homepage, click [link removed by mod], or type into your search bar. 20250402T135626Z-18568544f9c6hrtnhC1LON9us40000000f6g00000000385w

I can access the usual Azure admin stuff without a problem, it's just sites hosted in Azure that seem to block me.

Any ideas? Can I check if that IP address is on a blocklist of some sort and, if so, how do I remove it? I've had that netblock for a long time and, as far as I know, it's not been used for any malicious purposes!

And, given that it affects more than one website, I doubt whether it's a site-specific setting.

Cheers,

Phil

Azure Web Application Firewall

1 answer

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  1. G Sree Vidya 4,250 Reputation points Microsoft External Staff Moderator
    2025-08-11T05:06:49.0233333+00:00

    Hello Launchbury, Phil

    I understand that you are unable to access some sites hosted in Azure from certain IP Blocks.

    Could you please confirm if those Azure sites are hosted/owned by you?

    The issue you're describing suggests that there might be a problem with routing or firewall rules specific to certain IP blocks.

    If the Azure sites are hosted/owned by you, you could try the below steps to diagnose and potentially resolve the issue:

    Ensure that there are no misconfigured routing tables either within your network or on the Azure side that could be blocking traffic from the affected IP blocks.

    Check for any firewall rules that might be blocking traffic from the affected IP range while allowing it from the other range.

    Check Azure NSG (Network Security Groups). Ensure that the NSG rules on Azure are not inadvertently blocking traffic from the affected IP range. Verify both inbound and outbound rules.

    Use Azure Network Watcher to check for any anomalies or blocked traffic in the diagnostic logs. This can help identify if Azure is blocking the traffic and why.

    Refer: https://learn.microsoft.com/en-us/azure/virtual-network/manage-route-table

    https://learn.microsoft.com/en-us/azure/virtual-network/network-security-groups-overview

    https://learn.microsoft.com/en-us/azure/network-watcher/ip-flow-verify-overview

    I hope this helps! If these answers your query, do click the "Upvote" of which might be beneficial to other community members reading this thread.

    If the above is unclear or you are unsure about something, please add a comment below.

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