Hi, the URL http://www.gliffy.com/products/confluence-plugin/download/archive/gliffy-confluence-plugin-5.0.3.jar Consistently gives the error: ICAP protocol error. The system returned: [No Error] This means that some aspect of the ICAP communication failed. Some possible problems are: The ICAP server is not reachable. An Illegal response was received from the ICAP server. In the squid log: TCP_MISS/500 3347 GET http://www.gliffy.com/products/confluence-plugin/download/archive/gliffy-confluence-plugin-5.0.3.jar - HIER_DIRECT/63.246.25.247 text/html Increasing icap debug to level2: Fri Dec 21 06:14:03 2012, general, DEBUG squidclamav_init_request_data: initializing request data handler. Fri Dec 21 06:14:03 2012, general, DEBUG squidclamav_check_preview_handler: processing preview header. Fri Dec 21 06:14:03 2012, general, DEBUG squidclamav_check_preview_handler: preview data size is 1024 Fri Dec 21 06:14:03 2012, general, DEBUG squidclamav_check_preview_handler: X-Client-IP: 2001:918:xxxxx Fri Dec 21 06:14:03 2012, general, DEBUG squidclamav_check_preview_handler: URL requested: http://www.gliffy.com/products/confluence-plugin/download/archive/gliffy-confluence-plugin-5.0.3.jar Fri Dec 21 06:14:03 2012, general, DEBUG squidclamav_check_preview_handler: Content-Type: application/x-java-archive Fri Dec 21 06:14:05 2012, general, Bug in the service. Please report to the servive author!!!! Fri Dec 21 06:14:05 2012, general, DEBUG squidclamav_release_request_data: Releasing request data. grep icap /etc/squid/squid.conf: icap_enable on icap_send_client_ip on icap_send_client_username on icap_client_username_encode off icap_client_username_header X-Authenticated-User icap_preview_enable on icap_preview_size 1024 icap_service service_req reqmod_precache bypass=0 icap://127.0.0.1:1344/squidclamav icap_service service_resp respmod_precache bypass=0 icap://127.0.0.1:1344/squidclamav egrep -v '^#|^ *$' /etc/c-icap/c-icap.conf PidFile /var/run/c-icap/c-icap.pid CommandsSocket /var/run/c-icap/c-icap.ctl Timeout 300 MaxKeepAliveRequests 100 KeepAliveTimeout 600 StartServers 30 MaxServers 200 MinSpareThreads 10 MaxSpareThreads 20 ThreadsPerChild 10 MaxRequestsPerChild 0 Port 1344 User c-icap Group nogroup ServerAdmin root@xxxxxxxxxxx ServerName proxy.mydomain.ch TmpDir /tmp MaxMemObject 131072 DebugLevel 2 ModulesDir /usr/lib/c_icap ServicesDir /usr/lib/c_icap TemplateDir /usr/share/c_icap/templates/ TemplateDefaultLanguage en LoadMagicFile /etc/c-icap/c-icap.magic RemoteProxyUsers off RemoteProxyUserHeader X-Authenticated-User RemoteProxyUserHeaderEncoded on ServerLog /var/log/c-icap/server.log AccessLog /var/log/c-icap/access.log Service squidclamav squidclamav.so Service echo srv_echo.so egrep -v '^#|^ *$' /etc/c-icap/srv_squidclamav.conf maxsize 5000000 redirect http://myproxy.ch:8080/cgi-bin/clwarn.cgi clamd_local /var/run/clamav/clamd.ctl timeout 1 logredir 1 dnslookup 0 abort ^.*\.(ico|gif|png|jpg)$ abortcontent ^image\/.*$ abortcontent ^text\/.*$ abortcontent ^application\/x-javascript$ abortcontent ^video\/x-flv$ abortcontent ^video\/mp4$ abort ^.*\.swf$ abortcontent ^application\/x-shockwave-flash$ abortcontent ^.*application\/x-mms-framed.*$ whitelist .*\.clamav.net whitelist .*sourceforge\.net/.*clamav Any suggestions please? Can other verify this issue? I'm running a new compile about a week old. Thanks.....