Apache - problem z proxy

[lord_Niedzwiedz]

	Dotarłem do punktu w którym brakuje mi już koncepcji  ;-/
Z wyłączonym mod_security jest to samo.
Nie działa tylko z IE, z innych przeglądarek chodzi !!
I w czym problem ??!!

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[22/Mar/2016:12:50:47 +0100] VvExl1AwolwAADfOzOoAAAAP 8.4.16.2 64610
8.4.16.9 80
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POST /CR/Login/Zaloguj HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://test_kra.s2.aaaaa.pl/CR/Login
Accept-Language: pl-PL
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0)
like Gecko
Host: test_kra.s2.aaaaa.pl
Content-Length: 212
Connection: Keep-Alive
Cache-Control: no-cache

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HTTP/1.1 500 Internal Server Error
Cache-Control: private
Content-Type: text/html; charset=utf-8
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Content-Length: 10172
Via: 1.1 test_kra.s2.aaaaa.pl
Connection: close

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Apache-Handler: proxy-server
Stopwatch: 1458647447508868 21510 (- - -)
Stopwatch2: 1458647447508868 21510; combined=5, p1=0, p2=0, p3=0, p4=0,
p5=5, sr=0, sw=0, l=0, gc=0
Producer: ModSecurity for Apache/2.7.5 (http://www.modsecurity.org/);
OWASP_CRS/2.2.8.
Server: Apache/2.4.18 (Unix) OpenSSL/1.0.2g