AT&T Transparent Proxy not stable, hanging connections to websites
AT&T Transparent Proxy is failing sometimes. Suddenly, unable to navigate to any website, however ports other than 80 (HTTP) and 443 (HTTPS) work. Everything that goes through the Transparent Proxy (HTTP and HTTPS) stops working until I reset my data connection.
When it stops working, I'm still able to navigate to websites in different ports (for example 8081), FTP, ping, trace route, etc.
I'm unable to point exactly what AT&T proxy server is failing because this is something that hosts see. When it works, I can use online tools (for example http://amibehindaproxy.com/) and see some proxies like this: HTTP/1.1 nycnz02msp2ts04.wnsnet.attws.com.
This has been happening for almost 2 months, but got worse in the past two weeks, requiring data reset several times a day.
This is not related to my account as the connection is always available. It only fails when navigating to HTTP/HTTPS because these go through this transparent proxy. Everything else (FTP, other ports, etc.) always work.
If I use a VPN, I don't have this issue anymore because the VPN bypass this AT&T Transparent Proxy. However I can't (and don't want to) use VPN all the time.
Please investigate and fix this. There is nothing else I can do because it's on AT&T side (AT&T proxies).