How far does a traceroute get you? That could help isolate where the issue may be.
I've looked at one, but all that I can tell is I stop reaching things somewhere between my ISP and the datacenter the server is in.
I kinda think it may be on the isp then, maybe a v6 routing issue? You could work around with an ipv4 tunnel, then route ipv6 through it. If that's possible, I've never done it haha.
Yeah, ISP-related issue is all I can think of. I can connect to the server over v4 no problem, but the broken v6 connectivity to this particular endpoint is strange and nothing I've seen before...
I bet they get less reports on ipv6 issues than with ipv4. I have definitely seen carriers have ipv4 routing issues in enterprise networking.
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