POST XML common-info request returns "internal error"

Hello I have a program that sents an HTTP-POST XML "common-info" request.  But the server returns an "internal error".

When I read the XML returned from the "common-info" call all I get is what I posted above.

<results><status code="internal-error"><exception>java.sql.SQLException: [Macromedia][SQLServer JDBC Driver][SQLServer]Cannot insert the value NULL into column 'SESSION_COOKIE', table 'breeze5.dbo.PPS_USER_SESSIONS'; column does not allow nulls. INSERT fails. at macromedia.jdbc.base.BaseExceptions.createException(Unknown Source) at macromedia.jdbc.base.BaseExceptions.getException(Unknown Source) at macromedia.jdbc.sqlserver.tds.TDSRequest.processErrorToken(Unknown Source) at macromedia.jdbc.sqlserver.tds.TDSRequest.processReplyToken(Unknown Source) at macromedia.jdbc.sqlserver.tds.TDSRPCRequest.processReplyToken(Unknown Source) at

There is no session cookie returned from the server for me to use.

I tested out the same call exccept this time I just typed in the URL into my browser ( http://<server>/api/xml?action=common-info ) and it returns the correct XML with the session cookie.

Any ideas why when I post XML the server is returning an "internal error" and complains about inserting a NULL value in the table?

Any ideas are greatly appreciate.