problem with ssh port forwarding for http connections

[Qian Gong <q.gong@tue.nl>]

Hi,

I am trying ssh port forwarding for http connections by: 
	ssh -L2001:www.web.server:80 ssh_server
Then use mozilla to browse http://localhost:2001. Some web site can be
visited successfully. But for some web site it fails. There are two
problems.

1. If the website uses cookie, it will report the browser does not
support cookie.
2. Some web sites are "access denied".

Does it mean ssh port forwarding is not fully functional with http
connections? Is the mechanism of ssh port forwarding different from that
of iptables? 

Thanks a lot for your opinions.

Qian