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It's an IP routing issue, you should contact your internet provider and report them the problem. Maybe try to reset your modem router before.

Ok, then open a bash shell and run the following commands:
nslookup gratefulpapers.altervista.org
tracepath gratefulpapers.altervista.orgAnd post here the output

From here it looks fine, so it's probably a network issue. Please run the test you can find in the thread http://forum.en.altervista.org/issue-reporting/336-report-network-problems.html and post...