Spark Web not authenticating

I am using AD authentication. Users can connect with their AD credentials when using the regular spark client, but get rejected by sparkweb. Below is the headers from the browser. Can you help me find the problem?

POST /http-bind/ HTTP/1.1

Accept: text/javascript, text/html, application/xml, text/xml, /

Accept-Language: en-us

x-prototype-version: 1.5.1

Referer: http://im.bankserv.com:8080/sparkweb/index.jspa

x-requested-with: XMLHttpRequest

Content-Type: application/x-www-form-urlencoded; charset=UTF-8

Accept-Encoding: gzip, deflate

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)

Host: im.bankserv.com:8080

Content-Length: 107

Connection: Keep-Alive

Cache-Control: no-cache

HTTP/1.1 200 OK

Content-Type: text/xml; charset=utf-8

Content-Length: 537

Server: Jetty(6.1.x)

POST /http-bind/ HTTP/1.1

Accept: text/javascript, text/html, application/xml, text/xml, /

Accept-Language: en-us

x-prototype-version: 1.5.1

Referer: http://im.bankserv.com:8080/sparkweb/index.jspa

x-requested-with: XMLHttpRequest

Content-Type: application/x-www-form-urlencoded; charset=UTF-8

Accept-Encoding: gzip, deflate

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)

Host: im.bankserv.com:8080

Content-Length: 213

Connection: Keep-Alive

Cache-Control: no-cache

HTTP/1.1 200 OK

Content-Type: text/xml; charset=utf-8

Content-Length: 134

Server: Jetty(6.1.x)

POST /http-bind/ HTTP/1.1

Accept: text/javascript, text/html, application/xml, text/xml, /

Accept-Language: en-us

x-prototype-version: 1.5.1

Referer: http://im.bankserv.com:8080/sparkweb/index.jspa

x-requested-with: XMLHttpRequest

Content-Type: application/x-www-form-urlencoded; charset=UTF-8

Accept-Encoding: gzip, deflate

User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)

Host: im.bankserv.com:8080

Content-Length: 96

Connection: Keep-Alive

Cache-Control: no-cache

HTTP/1.1 200 OK

Content-Type: text/xml; charset=utf-8

Content-Length: 57

Server: Jetty(6.1.x)

Any errors in the Openfire logs?