I have been trying to torubleshoot this for some hours now and am at wits end.
There is a particular website that I can't see from my home.
Every other web site works fine.
The web site works fine from other networks.
To troubleshoot this:
Tested any other web site. - OK
The web site owner has confirmed that their website is operating OK and it tests fine from anywhere (except my house!)
I have tried three different browsers (Firefox, Opera and IE) on two different computers with two different OS's - Windows XP and Suse Linux.
Reset my ADSL modem.
Not only can I not access their web server, but I can't telnet to port 25, or even ssh to the router. Pings don't reply either.
For further diagnosis I connected my laptop to a wireless broadband modem and http, telnet, and ping all worked as expected.
So I connected to the Fortigate 80C router with ssh. From there I ran
diag sniffer packet any "host <my staticip>"
and ran ping tests. The results showed packets entering and leaving the router's public interface, yet my pc doesn't get the reply.
It seems that any traffic responses from this site don't reach me.
If I can solve the ping issue, I belive the rest will resolve as well. Given that it appears that the router is returning the pings, and I can ping other hosts OK, where to from here?
If there are no worthwhile ideas, I'll reboot the remote router.