I am unable to access 1sttix.org from any device (phone/computer - hard wired or wifi) when connected to Cox internet at home. I can access it from my phone plan (verizon) I tried customer support who had me reset system but still does not work.

I get the same - Tracing route to 1sttix.org [208.74.148.209]

3 11 ms 9 ms 8 ms 100.127.40.254
4 15 ms 13 ms 9 ms 100.120.124.20
5 18 ms 23 ms 18 ms ashbbprj01-ae2.rd.as.cox.net [68.1.0.242]
6 20 ms * * ash-b2-link.ip.twelve99.net [213.248.76.24]
7 19 ms 16 ms 14 ms ash-bb2-link.ip.twelve99.net [62.115.123.124]
8 21 ms 22 ms 19 ms nyk-bb2-link.ip.twelve99.net [62.115.136.200]
9 40 ms 38 ms 39 ms det-b2-link.ip.twelve99.net [62.115.113.35]
10 40 ms 40 ms 39 ms easyonline-ic-369073.ip.twelve99-cust.net [213.248.93.11]
11 39 ms 40 ms 39 ms dtw-elf2-po2.mojohost.com [104.193.123.253]
12 43 ms 43 ms 40 ms turbo.hosthead.com [208.74.148.209]

Thanks, so it is probably not a DNS issue.

More than likely, they are blocking his IP address, a traceroute, will probably show it stops pinging at my hop 11. 

it says forbidden 403