> 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 _______________________________________________ Help us build a comprehensive ClamAV guide: visit http://wiki.clamav.net http://www.clamav.net/support/ml