unreachable from outside

[cnsh]

I have set up an IPv6 tunnel, but cannot ping from outside, and cannot access open ports from outside.
Both ping and port scan works over IPv4, but IPv6 doesn't.
I'm using Frankfurt endpoint.
It's not my ISP's issue as they themselves have IPv6 services.

[cnsh]

Little update.
I knocked all firewalls down and then the port was reachable. (IPv4 host is reachable even when the firewall is up)
Wondering where I can make IPv6 firewall rules follow the ones of IPv4.

+ The IPv6 and Neighborhood Discovery Core Networking in advanced firewall is also enabled.