Same for me..
At home i can login successfully, but at work(Proxy), i have made a new test using IE..I could login only using IE. Using Firefox i got same error message...(Cleaned all caches, and using Same proxy from IE)
Reports from IE:
You are coming from IP address 200.157.35.21 using port 3367.
A DNS reverse lookup shows your hostname as inet4.petrobras.com.br.
Additional information known about your browser and about your connection to this server :
HTTP_USER_AGENT Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; Embedded Web Browser from: http://bsalsa.com/; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
HTTP_ACCEPT_CHARSET --
HTTP_ACCEPT_ENCODING gzip, deflate
HTTP_ACCEPT_LANGUAGE pt-br
HTTP_CONNECTION keep-alive
HTTP_CACHE_CONTROL --
HTTP_REFERER --
REMOTE_ADDR 200.157.35.21 (inet4.petrobras.com.br)
REMOTE_PORT 3367
REQUEST_METHOD --
query_string -- /services/wru.php HTTP/1.1
HTTP_COOKIE KLTwru 1265814766 hello world...
Reports from FF:
You are coming from IP address 200.157.35.21 using port 3305.
A DNS reverse lookup shows your hostname as inet4.petrobras.com.br.
Additional information known about your browser and about your connection to this server :
HTTP_USER_AGENT Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-BR; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)
HTTP_ACCEPT_CHARSET ISO-8859-1,utf-8;q=0.7,*;q=0.7
HTTP_ACCEPT_ENCODING gzip,deflate
HTTP_ACCEPT_LANGUAGE pt-br,pt;q=0.8,en-us;q=0.5,en;q=0.3
HTTP_CONNECTION keep-alive
HTTP_CACHE_CONTROL max-age=0, max-age=0, max-age=0
HTTP_REFERER --
REMOTE_ADDR 200.157.35.21 (inet4.petrobras.com.br)
REMOTE_PORT 3305
REQUEST_METHOD --
query_string -- /services/wru.php HTTP/1.1
HTTP_COOKIE KLTwru 1265815100 hello world...