I am attempting to connect to a program called Fishbowl.  It runs a server off of a computer.  When I make the connection to it I get an error that says "incoming message length invalid, message length 1347375956 bytes"  I can take the xml out of my code and put it into their connection testing tool and it works.  here is my code:

public void connect(){
    HttpRequest req = new HttpRequest();
    req.setEndPoint('http://11.111.111.111:28192');
    
    
    DOM.Document doc = new DOM.Document();
        Dom.XmlNode envelope = doc.createRootElement('FbiXml',null,null);
            dom.XmlNode header2 = envelope.addChildElement('Ticket', null, null);
                dom.XmlNode header3 = header2.addChildElement('Key', null, null);
            dom.XmlNode header1 = envelope.addChildElement('FbiMsgsRq', null, null);
            dom.XmlNode body = header1.addChildElement('LoginRq', null, null);
                body.addChildElement('IAID', null, null).addTextNode('123456');
                body.addChildElement('IAName', null, null).addTextNode('FishbowlKyazmaTest');
                body.addChildElement('IADescription', null, null).addTextNode('his is a test of the connection');
                body.addChildElement('UserName', null, null).addTextNode('admin');
                body.addChildElement('UserPassword', null, null).addTextNode('ISMvKXpXpadDiUoOSoAfww==');
    req.setCompressed(true);
    req.setBodydocument(doc);
    req.setMethod('POST');
    Http http = new Http();
    system.debug(logginglevel.info, '*****req='+req);
    HTTPResponse res = http.send(req);
    System.debug(res.getBody());
}

 Any idea why it would be receiving such a large message?