> Does it work if you append a random GET parameter to the URL (like 
> ?unused=test).

Nope, still the same. Maybe somebody configured varnish to give my IP
address range (193.175.73.20x) a 503: Service Unavailable? 

$ wget -nd -S "http://cgi.clamav.net/sendfp.cgi?unused=test";
--2012-04-19 15:50:26--  http://cgi.clamav.net/sendfp.cgi?unused=test
Resolving proxy.charite.de (proxy.charite.de)... 141.42.1.205


Connecting to proxy.charite.de
(proxy.charite.de)|141.42.1.205|:8080... connected.
Proxy request sent, awaiting response... 
  HTTP/1.0 503 Service Unavailable
  Server: Varnish
  Content-Type: text/html; charset=utf-8
  Retry-After: 5
  Content-Length: 284
  Accept-Ranges: bytes
  Date: Thu, 19 Apr 2012 13:50:26 GMT
  X-Varnish: 216817722
  Age: 0
  Via: 1.1 varnish
  X-Cache: MISS from proxy-cvk-1
  Connection: keep-alive
2012-04-19 15:50:27 ERROR 503: Service Unavailable.
                        
-- 
Ralf Hildebrandt                   Charite Universitätsmedizin Berlin
ralf.hildebra...@charite.de        Campus Benjamin Franklin
http://www.charite.de              Hindenburgdamm 30, 12203 Berlin
Geschäftsbereich IT, Abt. Netzwerk fon: +49-30-450.570.155
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