Distrowatch down for several days?

[Gary Coady]

There's another possibility for this problem that comes to mind - broken
PMTU discovery.

Try
sudo sh -c "echo -n 1 > /proc/sys/net/ipv4/ip_no_pmtu_disc"

If you can connect after this, a temporary fix is to put
net/ipv4/ip_no_pmtu_disc=1
into /etc/sysctl.conf

Longer-term, a better fix would be to find out who is responsible for
blocking ICMP type 3 packets, and asking nicely for them to be let
through :-) The responsible machine could be any box between your
machine and the problematic server, though.

Gary.