Post for consultation of NF-e data

Question

I am trying to get the data of an electronic invoice through a post on the farm site. I am using the Jsoup library.

First I did a get to get the captcha image and it worked perfectly. I created my screen with inputs for key nfe and catcha and when I submit the form I call the post routine to get the note data.

Only in this post only brings the error page, stating invalid captcha code.

Follow the GET code:

URL_GET = http://www.nfe.fazenda.gov.br/portal/consulta.aspx?tipoConsulta=completa&tipoConteudo=XbSeqxE8pl8=
Document doc = Jsoup.connect(URL_GET).get();
String imgCaptcha = doc.select("#ContentPlaceHolder1_imgCaptcha").attr("src");

Follow the code of the POST:

    URL_POST = http://www.nfe.fazenda.gov.br/portal/consulta.aspx?tipoConsulta=completa&tipoConteudo=XbSeqxE8pl8%3d
doc = Jsoup.connect(URL_POST)
            .data("__EVENTTARGET", "")
            .data("__EVENTARGUMENT", "")
            .data("__VIEWSTATE", dados.getViewState())
            .data("__EVENTVALIDATION", dados.getEventValidation())
            .data("ctl00$txtPalavraChave", "")
            .data("ctl00$ContentPlaceHolder1$txtChaveAcessoCompleta", dados.getChaveAcesso())
            .data("ctl00$ContentPlaceHolder1$txtCaptcha", dados.getImgCaptcha())
            .data("ctl00$ContentPlaceHolder1$btnConsultar", "Continuar")
            .data("ctl00$ContentPlaceHolder1$token", dados.getToken())
            .data("ctl00$ContentPlaceHolder1$captchaSom", dados.getCaptchaSom())
            .data("hiddenInputToUpdateATBuffer_CommonToolkitScripts", "1")
            .userAgent("Mozilla")
            .post();

The data (__VIEWSTATE and __EVENTVALIDATION) I take from GET and throw in the POST. The other data is default and the key and captcha recover from what the user has reported...

Someone has done something similar?