Tom and Ruben,
traceroute to 44.165.2.4 (44.165.2.4), 30 hops max, 60
byte packets
1
kb3vwg-001.ampr.org (44.60.44.1) 1.385 ms 1.392 ms 1.593 ms
2
mail.sp2l.ampr.org (44.165.2.2) 154.783 ms 171.077 ms 171.653 ms
3
home.sp2l.ampr.org (44.165.2.4) 171.674 ms 171.668 ms 171.650 ms
I cannot ping, connect or traceroute you either.
When it works from your side and not from ours, are you sure you have a *working*
incoming IPIP protocol forward or DMZ host? It is all too common for stations behind
ISP NAT modem/routers to have IPIP tunnels that work only outbound (and replies), not
for unsolicited inbound traffic, because they only admit IPIP traffic as replies to
their own outging traffic, even when they have set a DMZ host in their router.
(which often only works for protocols like ICMP, TCP and UDP)
Rob