Rick Furr's www.vcalc.net: Is it gone? (resolved)

[jebem]

I checked DNS resolution and it seems to be fine. I get the same IP address from 3 different DNS servers:
Name: "www.vcalc.net"
Address: 216.252.197.18

It looks like my hhtp connections to this site is being blocked as I get a timeout on HTTP, but the PING reply just fine.
I get this behavior from any machine using my home ISP router when accessing that site only (using three different PC's and a Tablet - that's what I got at home now).

However I just found out that I can access the site from my mobile phone (having the wi-fi disconnected to force the connection thru the GSM network).

So the site is online, but I have a probable firewall issue on my home ISP network.
And this is really odd, as I'm pretty sure I never created such a rule on my internal firewall appliance.
I think I will have a talk with my ISP help desk line on Monday.