When using URL filtering, you are unable to block some https websites such as facebook. After refreshing the page, only then will the website be blocked.

In the debug logs, entries like the following can be seen:

• The client accesses HTTPs website using the IP address instead of URL hostname.

• IWSVA cannot get the Hostname from the client hello.

  16:30:12.527 <DBG><7:15305:15335> Cannot get host name from client hello
  16:30:12.528 <DBG<7:15305:15335> NAT mode=false
  16:30:12.528 <DBG><7:15305:15335> Original destination ip is X.X.X.X, destination port is 443
  16:30:12.528 <DBG><7:15305:15335> 59 bytes read from [285].

  16:30:12.528 <DBG><7:15305:15335> HTTP request -- method "CONNECT" version "1.1" URI "X.X.X.X:443"

• The traffic was tunneled by IWSVA, and client will never try to access the URL second time.

  16:30:12.545 <DBG><7:15305:15335> [286] Connected to the server on port 1214.
  16:30:12.545 <DBG><7:15305:15335> Entering into tunnel mode ( SSL-relay )

• The following setting under [https-scanning] in the file /etc/iscan/intscan.ini has been set to "no":

  client_hello_no_host_tunnel=no