WU's doesn't reach my computer

sometimes there are WU seen on the website, that have never reached my computer - connection without success always. I can't do anything and so they go into timeout. What about a final test from BOINC, if the WU has reached the client successfull. This also happens in Proteinpredictor@home.
(p.e. WU 10274513, 10269536)
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