[squid-users] Squid and Java applets

Hi list,

is there any special config I need to allow java content?

CentOS 6.3 x64
Squid 3.1.10

I can't get this Java applet:
(Software-Zertifikat - Login)
https://www.elsteronline.de/eportal/Oeffentlich.tax

But only with Windows 2003 and IE8! Win7/Win2008 with IE9 works fine. With Win2003 IE tells me, that no Java was found on this machine. When I use a direct connection via firewall instead of squid proxy, it works fine.

I found some "allow java" configs, but they don't work in this case.

acl Java browser Java/1.1 Java/1.2 Java/1.3 Java/1.4 Java/1.5 Java/1.6 Java/1.7
acl default_allowed_useragents browser (Java)
acl Durchgang url_regex .i \.jar$
http_access allow Java
http_access allow all default_allowed_useragents
http_access allow Durchgang all

Thanks for help

--
 Marcel