Norton Internet Security For Mac Security 4 (OSX 10.6.8)

Hi

 

I have an iMac running OSX 10.6.8 and have just installed Internet Security 4.

 

I have a problem with the firewall blocking other machines accessing  the web server (apache) runnining on this machine via port 80. 

 

I have port 80 web sharing enabled andI can access the web server if the application firewall is disabled in advanced options.

 

I am getting an log entry due to blocking of incoming access to the web server program /usr/sbin/httpd . When I disable application firewall it seems to work.  I cannot add the application /usr/sbin/httpd to the firewall and create a rule as it is not displayed when prompted to select the application, the directory is hidden and not visible.

 

Is there any way of adding /usr/sbin/httpd to the application rules so I can reenable the firewall or have I missed something?

 

Regards

 

Damien