If the webproxy is enabled as well as ipv6(tunnel broker freenet6) the proxy will block astaro.com.
The block page says network unreachable. I know astaro.com was working via ipv6 as of yesterday so unless this is a coincidence. I turned off ipv6 and it worked, turned it back on and same results. I made sure I could get to ipv6.google.com and ran a web based ipv6 tests and those were all fine.
Attached a screen shot
The http log shows this:
2012:03:01-19:39:05 asg-1 httpproxy[18309]: id="0002" severity="info" sys="SecureWeb" sub="http" name="web request blocked" action="block" method="GET" srcip="2001:5c0:1105:blah:blah:blah:blah:blah" dstip="2a02:788:12:38::5" user="" statuscode="502" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="2538" request="0xfafc2e0" url="astaro.com/.../Hardware"