Page Not Found error using FRAMES

Question

Hi,
I am using servlets on Unix/Tomcat server. I am getting a 'Page Not Found' error on IE only (it works fine on Netscape) in one of the servlet applications for 'dial up' and 'cable modem' connection. There is no error, if you let it sit there for a while and try it again.
This particular application is working fine on IE with LAN connection.
In this servlet, I am using 'post' method for query string. And this same servlet invoking two frames (calling two other servlets) using 'get' method to retrive the information and displaying in frames.
Help is greatly appreciated, if anyone knows the solution.
Thanks
Nkumar

Answer 1

Thanks for the response. I am using synchronized for all three servlets. The first servlet calls two other servlets as follows:
public synchronized void doPost{HttpServletRequest      request, HttpServletResponse     response
  ) throws ServletException, IOException
Is it right?
Kumar