Alert Central - Can connect HTTPS but not HTTP - Help

I have installed Alert Central on ESXi 4.1.0 confguring with vSphere client.

I can connect Alert Central admin console through https://10.1.x.x:5480 . However i am unable to connect through http://10.1.x.x.

- Checked is not network or FW.

- Checked port 8080 is listerning.

- Checked document-root has 'index.html.

Any idea? Help will be appreciated. Thanks.