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I'm having a strange internet access problem that I don't know how to debug. A specific set of sites will fail to load with "Connection Reset" status about 90% of the time. Accessing them by their IP yields the same results. Pinging the IP works (no packet loss). I'm running Windows Server 2012 with latest updates installed.
Fiddler (HTTP MITM debugger) is telling me that the HTTP response is "HTTP 504". Wireshark is showing me receiving "Connection Reset" packets on the TCP level.
I've tried the following changes:
Problem persists when:
- Accessing by IP
- Using wget
- Using a different network adapter (USB-tethered phone with 3G)
- Using a different browser
- Using a browser inside a VirtualBox VM
- Disabling the firewall
- Booting into Safe Mode w. networking.
- Changing DNS server.
- Logging in as a different non-admin user.
Problem disappears when:
- Using a different machine
- Using TOR
- Using a different OS
- Reissuing the HTTP request more than five times in Fiddler (i.e. the first 5 reissues fail, then ones after that work).
- Capturing the HTTP request using Fiddler and reissuing it on another machine.
My last resort will be to reinstall the OS. Is there anything else I can try to debug this problem?
Troubleshooting steps are often OS-specific. It helps if you tell us your OS. – Spiff – 2015-01-24T17:13:18.153
It's windows server 2012. – DarthShader – 2015-01-24T17:38:12.457