[mod-security-users] mod_security IE vs Firefox problem

[<rud...@ne...>]

Hi,
I'm a beginner using mod_security (Version 1.6.0 - 2008/02/19) with apache (apache2-2.0.59-1.17) on SLES9 SP4.
It works fine but in the modsec_audit log file there are messages. These messages will appear using Microsoft IE 8 (8.0.6001) at the beginning of the session. But after these Messages the application will work fine. The user will not be notified, there is no "403 Forbidden" message. But using Firefox (3,5 or 3.6) there are no Messages in the modsec_audit log file.
What ca I do to eliminate these messages?
The applicaation is secured by using server and client certificates.

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[27/Sep/2010:10:58:20 +0200] 7hzFKMCoMiAAAEqFHgEAAACD (my_ip) 3125 (server-ip) 443
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GET /appl/entry.do HTTP/1.1
Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
Accept-Language: de
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 1.1.4322)
Accept-Encoding: gzip, deflate
Host: 192.168.50.30
Connection: Keep-Alive

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HTTP/1.0 403 Forbidden
Vary: accept-language,accept-charset
Accept-Ranges: bytes
Connection: close
Content-Type: text/html; charset=iso-8859-1
Content-Language: de

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Apache-Handler: type-map
Stopwatch: 1285577900868904 18601 (- - -)
Producer: ModSecurity for Apache/2.5.10 (http://www.modsecurity.org/); core ruleset/1.6.0.
Server: Apache

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Thanks a lot.

Bye
Rudi