nmap result show my port 80 be filtered, plz help

Eric Lin asked 2 years ago

Dear expert(like Shnerdly):

my webhosting again, have trouble(not work).
under att uverse and motorola NVG510 dsl-router.

my follow some suggestion, test by nmap on all ports in my linux system.

here is what I got.(it ever work, and when it
beginning to not work, I still can use some free proxy site to type in my (public-external)ip(v4) to
see my website. But now it all gone. My firefox just reply "too long , time out".(some one on the
linux list told , it is At&t or us gov block. But whatismyip site response my public ip is not under block list.)

----------------------
Not shown: 65532 closed ports
PORT STATE SERVICE
53/tcp open domain
80/tcp filtered http
7547/tcp open unknown

Nmap done: 1 IP address (1 host up) scanned in 11.18 seconds
----------------
plz help, Eric Lin, in LA

1 Answers
Shnerdly Staff answered 2 years ago

Your nmap results show that port 80 is "filtered". That means something is blocking nmap from getting a good test result. It could be being blocked by the ISP or it could be a firewall issue.

Have you made any changes on your Linux server or changes to your router or added anything new to your network? If so, try working back to see what is blocking the port.

If you call your ISP, they will tell you if they are blocking any ports on your IP. Unless you have requested it be open, port 25 will certainly be blocked by them but they may also be blocking port 80 if they are seeing too much traffic on that port to your IP.

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