I think the problem may be more complicated than you think. If person B got one of your certificates, and person C is talking to person B's machine, you could be seeing verification attempts from C when B is where the issue is at. In any case, the following might give you a starting point:
$ host 2001:470:1f07:224:8570:356e:2715:7be6
Host 6.e.b.7.5.1.7.2.e.6.5.3.0.7.5.8.4.2.2.0.7.0.f.1.0.7.4.0.1.0.0.2.ip6.arpa not found: 3(NXDOMAIN)
$ host 2001:470:1f07:224::1
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.2.2.0.7.0.f.1.0.7.4.0.1.0.0.2.ip6.arpa domain name pointer router.abellohome.net.
$ host 2001:470:1f06:224::1
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.2.2.0.6.0.f.1.0.7.4.0.1.0.0.2.ip6.arpa domain name pointer vabello.tunnel.tserv4.nyc4.ipv6.he.net.
$
Alternatively, you could try firewall blocking his address. Or, more likely to get a reaction, putting a rate limiter on the request. A one byte per 10 second limit might slow some application he's running down enough that he notices it.
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Topic: How or Where to tell? (Read 5381 times)