Well, finally got home from work, disabled sixx but can't connect/ping any IPv6 address.
Seems Terado isn't setting up a tunnel. Googled to find out anything that may help, but info on this is limited, if not non-existant.
C:\>tracert 2001:4de0:1::1:1
Tracing route to 2001:4de0:1::1:1 over a maximum of 30 hops
1 99 ms * 115 ms 2a00:801:0:12::2
2 223 ms 72 ms 103 ms 2a00:801:0:12::1
3 76 ms * 94 ms 2a00:800:0:1::81:1
4 92 ms * 85 ms 2a00:800:0:1::e:2
5 101 ms 110 ms 209 ms 2a00:800:0:1::4:1
6 167 ms 204 ms 224 ms 2a00:800:0:1::47:2
7 114 ms 116 ms 108 ms 2001:7f8:4::32bd:1
8 111 ms 84 ms 117 ms 5-3.r2.lo.v6.hwng.net [2001:4de0:1000:24::1]
9 113 ms 121 ms 96 ms 1-3.r3.lo.v6.hwng.net [2001:4de0:1000:25::1]
10 * * * Request timed out.
11 106 ms 107 ms 105 ms 2001:4de0:a::a
12 232 ms 132 ms 106 ms 2001:4de0:1::1:1
Trace complete.
C:\>
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Your ISP DNS Server might not resolve IPv6 specific addresses, you might try to set your DNS server to a publicly available server that does comply to IPv6.