Frustrating IIS

alanp · Post by **alanp** » Fri Nov 19, 2004 12:23 am

Hi,

If anyone has any ideas on this I'd be really grateful - it's driving me round the bend!

I have a LAN in my house, connected to the internet via a DSL router using NAT and DHCP. The problem is my computer appears to have an imaginary firewall! I can access the net, etc., as can all the other computers on the network. I can ping my computer's ip and other computers, but they can't ping me.

First thought: I must have a firewall - however, I've disabled windows firewall (XP SP2) and turned off ZoneAlarm but still nothing. This is really annoying as I'm trying to run a web server with IIS, which is inaccessible at the moment, presumable for the same reason.

Please help!

Post by **mid_gen** » Fri Nov 19, 2004 9:38 am

You don't have any dodgy VPN clients installed do you? They do some weird things sometimes.

As for no firewall, NAT does provide a firewall of sorts. It doesn't allow any incoming traffic unless it matches outgoing traffic to/from the same source.

If you want a web server on your PC to be visible to people on the internet, you will need to forward port 80 to your machine from your router.

LemonSHARK · Post by **LemonSHARK** » Fri Nov 19, 2004 9:42 am

Even though you turn the firewall off in XP (SP2) you will also have to enable 'Allow Incoming ICMP' somewhere in some advanced options. I think there's some option to allow port 80 somewhere too.