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I'm running a small website on my IP (IPv4) address. Suddenly, since last night, nobody could establish a new connection to my IP, they get a connection timeout. This is despite my internet seemingly functioning normally.

I can reach all the ports internally from my LAN Until last night, I could reach the port from the internet I've tried a traceroute, it never reaches my IP address.

19  lag-1.hcr01bflomnar.netops.charter.com (96.34.22.167)  83.603 ms  83.720 ms  83.599 ms
20  lag-10.hcr02bflomnar.netops.charter.com (96.34.22.127)  83.422 ms  83.420 ms  83.439 ms
21  lag-18.bflomnar02h.netops.charter.com (96.34.23.19)  84.019 ms  83.880 ms  83.744 ms
(all *s below)

No matter where I traceroute from, these are always the last 3 steps (my ip is different from what's listed for lag-18), which leads me to believe that whatever node is after the lag-18 hop is what is dropping packets...

I've contacted charter, who in fact is my ISP, my account is in good standing, and after a tech was sent out, they mentioned that there's no signal issue.

So with that said, I'm out of options here. Something is dropping inbound connections, but not my outbound connections.

How can I diagnose this further?

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  • Are you positive that your IP address simply hasn’t changed or are you paying for a static IP address?
    – Ramhound
    Commented Jun 26 at 20:39
  • @Ramhound I'm very sure. whatismyipaddress.com has been very consistent, even after flushing my cache.
    – tuskiomi
    Commented Jun 26 at 20:40
  • I assume you have tried to simply reboot your system and networking equipment?
    – Ramhound
    Commented Jun 26 at 20:42
  • @Ramhound Yes, and the internet support has had me do the same thrice over.
    – tuskiomi
    Commented Jun 26 at 20:42
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    Note that while tracert may or may not perform probes using ICMP, it does use ICMP TTL Exceeded response messages from each node along the path, so if a node doesn't respond, blocks ICMP outbound, or is filtered along the return path, the IP will not be displayed in the results. the signals may actually be reaching your IP, but the response doesn't get sent, so it appears to be unreachable. I believe Windows uses ICMP to probe, Linux uses UDP, and other systems may use TCP.
    – Frank Thomas
    Commented Jun 26 at 21:00

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