Ok with proxomitron / not ok with screen-scraper / why?

FireFox => screen-scraper => proxomitron => http//annuaire.socgen8003/annuaireSG/accueil_canalsg.jsp

+++GET 430+++
GET /annuaireSG/accueil_canalsg.jsp HTTP/1.1
User-Agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv1.7.10) Gecko/20050716 Firefox/1.0.6
Keep-Alive 300
Accept text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language en-us,en;q=0.5
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Host annuaire.socgen
Connection keep-alive
Retry 430...
Retry 430...
** 430 Socket Error 10061 for connect() **
+++CLOSE 430+++

+++GET 431+++
GET /favicon.ico HTTP/1.1
User-Agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv1.7.10) Gecko/20050716 Firefox/1.0.6
Keep-Alive 300
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Accept-Language en-us,en;q=0.5
Accept image/png,*/*;q=0.5
Host annuaire.socgen
Connection keep-alive
Retry 431...
Retry 431...
** 431 Socket Error 10061 for connect() **
+++CLOSE 431+++

FireFox => proxomitron => http//annuaire.socgen8003/annuaireSG/accueil_canalsg.jsp

+++GET 386+++
GET /annuaireSG/accueil_canalsg.jsp HTTP/1.1
Host annuaire.socgen8003
User-Agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv1.7.10) Gecko/20050716 Firefox/1.0.6
Accept text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Referer http//canalsg.socgen/
Connection keep-alive

+++RESP 386+++
HTTP/1.1 302 Moved Temporarily
Date Tue, 13 Sep 2005 140929 GMT
Pragma no-cache
Location http//annuaire.socgen8003/annuaireSG/Framework/Commun/Logon?codeTypeAcces=IC_GPSG_CANALSG
Server WebLogic Server 7.0 SP4 Tue Aug 12 112226 PDT 2003 284033
Content-Type text/html
Expires -1
Transfer-Encoding Chunked
Set-Cookie JSESSIONID=DmdZJdG1P9A8VC1dgxchS6i6Yc3j25jbo1JuuIgxoU4vOYjRDj79!2000064157; path=/
Set-Cookie PORTAIL=http//canalsg.socgen/; path=/
Set-Cookie ANNUAIRE=http//annuaire.socgen8003/annuaireSG/index.jsp?codeTypeAcces=IC_GPSG_CANALSG; path=/
Cache-Control no-cache
+++CLOSE 386+++

+++GET 387+++
GET /annuaireSG/Framework/Commun/Logon?codeTypeAcces=IC_GPSG_CANALSG HTTP/1.1
Host annuaire.socgen8003
User-Agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv1.7.10) Gecko/20050716 Firefox/1.0.6
Accept text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Referer http//canalsg.socgen/
Cookie JSESSIONID=DmdZJdG1P9A8VC1dgxchS6i6Yc3j25jbo1JuuIgxoU4vOYjRDj79!2000064157; PORTAIL=http//canalsg.socgen/; ANNUAIRE=http//annuaire.socgen8003/annuaireSG/index.jsp?codeTypeAcces=IC_GPSG_CANALSG
Connection keep-alive

+++RESP 387+++
HTTP/1.1 302 Moved Temporarily
Date Tue, 13 Sep 2005 140929 GMT
Pragma No-cache
Location http//annuaire.socgen8003/annuaireSG/Framework/Commun/Login?codeTypeAcces=IC_GPSG_CANALSG
Server WebLogic Server 7.0 SP4 Tue Aug 12 112226 PDT 2003 284033
Content-Type text/html
Expires Thu, 01 Jan 1970 000000 GMT
Transfer-Encoding Chunked
Cache-Control no-cache
+++CLOSE 387+++

etc...

Why can't I get

HTTP/1.1 302 Moved Temporarily
Date Tue, 13 Sep 2005 140929 GMT
Pragma no-cache
Location http//annuaire.socgen8003/annuaireSG/Framework/Commun/Logon?codeTypeAcces=IC_GPSG_CANALSG
Server WebLogic Server 7.0 SP4 Tue Aug 12 112226 PDT 2003 284033
Content-Type text/html
Expires -1
Transfer-Encoding Chunked
Set-Cookie JSESSIONID=DmdZJdG1P9A8VC1dgxchS6i6Yc3j25jbo1JuuIgxoU4vOYjRDj79!2000064157; path=/
Set-Cookie PORTAIL=http//canalsg.socgen/; path=/
Set-Cookie ANNUAIRE=http//annuaire.socgen8003/annuaireSG/index.jsp?codeTypeAcces=IC_GPSG_CANALSG; path=/
Cache-Control no-cache

when i pass through screen-scraper ?

Many thanks for your help (