2 weeks ago
I think something is blocking port 80 from
Source 107.77.xxx.xxx (my mobile phone on AT&T)
Destination 76.88.xxx.xxx (my web server at home on TWC)
The result I get on the phone is there is no response and eventual timeout.
The website is up and I can access it just fine from a browser on a PC from anywhere else I try.
When troubleshooting, I run tcpdump on port 80 on my server and no traffic is detected.
Some testing info...
However, from the *same* phone...
The problem seems pretty isolated to my phone service and my web server and port 80.
I have not tried forcing my cable modem to get a new IP address. It was last changed March 2016.
How can I find what is blocking access?
2 weeks ago
Don't use port 80, it's garbage to doi so and is a huge security risk as all hackers go after it first.
Next, You're running a server on TWC residential service?
Probably a violation of the contract, lol.
2 weeks ago - last edited 2 weeks ago
Nobody with any internet experience would leave port 80 open and unfiltered. It's the most popular target for malware delivery to folks who don't turn on their router firewalls. Common substitute ports which have to be specifically opened for use are 1080, 2080, 8080, and 10080.
Also, since AT&T and TWC share some fiber transport hops, it's possible that port 80 is blocked at the IXP crossover points.