Starting this weekend, I have been unable to connect to certain websites. The one that consistenly is a problem (completly unable to connect to) is stackoverflow.com.
- I can ping this host and tracert looks fine. I just spent 45 minutes chatting with a support representative, to no avail.
- I can connect to this site from my work network or using an Internet Proxy just fine.
- I can connect to this site from my iPhone over AT&T LTE just fine.
- I've verified the issue exists from any of my desktop computers which are wired and connected directly to the FiOS router and from my iPhone over Wi-Fi.
- I've rebooted the router.
- I've had other sites with this issue as well, but the others are more intermittment.
Since I can ping the host, it seems to me that something is blocking port 80 and port 443 for this IP address or subnet.