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If you’re running into connection problems when trying to visit websites hosted on the Microsoft Azure edge network, especially endpoints like part-0016.t-0009.t-msedge.net, and you’re using IPv6, here’s a simple solution to try.
Many users have noticed that their browsers hang when trying to load these sites with IPv6 enabled, even though IPv4 works perfectly fine. The issue seems to be related to how IPv6 handles larger data packets, which might be blocked or not properly processed somewhere along the network path.
First, check if the problem persists with IPv6 turned off. If the website loads smoothly over IPv4 but not IPv6, this confirms the problem is specific to IPv6 connectivity.
To troubleshoot:
1. Disable IPv6 on your device temporarily.
2. Refresh the website to see if it loads correctly.
3. If it works with IPv4 but not IPv6, then the issue is likely related to how your network or the Azure edge network manages IPv6 traffic.
A common cause is what’s called a Path MTU Discovery (PMTUD) failure. This means that large data packets (around 1500 bytes) are being dropped because the network doesn’t properly communicate that they are too big. Usually, on a functioning network, the path should tell your device to send smaller packets, but that isn’t happening here.
Interestingly, smaller packets used during the initial handshake often go through without a problem, which is why the SSL handshake completes successfully. The delay happens when trying to send larger data after the handshake, leading to indefinite loading.
The good news is that many systems, like iOS, handle this better by quickly falling back to IPv4 or using aggressive fallback mechanisms. Windows and Linux systems, however, might hang longer due to this bug.
To work around this issue:
– Keep IPv6 disabled if you’re encountering these problems frequently.
– Alternatively, you could try to set your device or router to ignore or block large IPv6 packets or ICMPv6 “Packet Too Big” messages, but this is more advanced and might impact other services.
If you’re a network administrator or tech-savvy user, it’s a good idea to report this issue to Microsoft Azure support with details about your network environment. They might need to check if there’s a mismatch in MTU settings or if ICMPv6 messages are being blocked at the Azure edge nodes.
In the meantime, disabling IPv6 on your device when accessing these Azure-hosted sites should help you avoid the hang-ups and load pages smoothly.
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