Hi,
The reason is that sweden.se has broken IPv6 at the moment (and you are on a IPv6 capable network).
Because the Avast webshield works as a transparent proxy, the web browser does not make a reconnect
attempt using IPv4 that it would do without Avast, when the IPv6 connection (that it tries first) fails.
Adding an exception won't work either in this case, because the exceptions only affect the "application
level", not the "network level", i.e. the connections go through the proxy regardless of any exceptions
(but the content is not scanned).
More technical info can be found here:
http://public.avast.com/~tuma/techinfo/To sum it up - the solution is to make Sweden fix their web site. If that does not work ;-), than you can temporary
disable the webshield or at least IPv6 in the webshield.