network checks: reimplement
after the rewrite we should redesign this in a robust way.
(from redmine: created on 2013-01-15, relates #2056 (closed), relates #5322 (closed), duplicates #2568 (closed), duplicates #6059 (closed))
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after the rewrite we should redesign this in a robust way.
(from redmine: created on 2013-01-15, relates #2056 (closed), relates #5322 (closed), duplicates #2568 (closed), duplicates #6059 (closed))