My problem is that the Default Web Site can be opened from the server machine (localhost), but cannot be opened from a test machine (which is in the same LAN). Netstat says that IIS 7.5 is listening on 0.0.0.0:80. WireShark shows that the browser on the test machine emits three TCP SYN packets, and these packets reach the web server, but there is no SYN-ACK (etc).
What am I doing wrong? Thank you for your help.