[질문] Squid를 사용한 Proxy 문제;;

잘 되다가 갑자기 저런 에러가 튀어나오네요;;
무엇이 문제인지 잘..;;
혹시 이런 에러 나신 분 있나요?

ERROR
The requested URL could not be retrieved

While trying to process the request:

GET / HTTP/1.1
Host: xxx.xxx.xxx.xxx
User-Agent: Mozilla/5.0 (X11; U; Linux i686; ko-KR; rv:1.9.0.11) Gecko/2009061613

CentOS/3.0.11-2.el5.centos Firefox/3.0.11
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: ko-kr,ko;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: EUC-KR,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive

The following error was encountered:

* Invalid Request

Some aspect of the HTTP Request is invalid. Possible problems:

* Missing or unknown request method
* Missing URL
* Missing HTTP Identifier (HTTP/1.0)
* Request is too large
* Content-Length missing for POST or PUT requests
* Illegal character in hostname; underscores are not allowed