While 8001 is for login, Packet Tracer uses other specific ports for its simulation features: : Multiuser functionality (off by default). 39000-39999 : Inter-process communication (IPC). 58000 : Network Controller Real World Server.
Once you have configured port 8001 and set up the web server and client devices, you can simulate client-server interactions. To do this: cisco packet tracer port 8001