networking
6 traces
- Cloudflare challenge page hangs forever (spinner, no error): network blackholes UDP 443 and Chrome QUIC never falls backA Cloudflare-fronted site shows its "verify you are human" check; after the checkbox passes, the page hangs indefinitely. Fix: Launch Chrome with QUIC disabled (or disable it in chrome://flags/#enable-quic): Disabling…
- Some sites load blank on Mac after a proctored-exam app: DNS left overridden to 1.1.1.2 (Cloudflare filter)Specific websites (e.g.
- macOS loses internet after plugging into a machine/PLC network: the cable's DHCP gateway becomes the default routeWhile probing CNC controllers over a USB Ethernet adapter, all internet traffic from the Mac suddenly died. Fix: Put Wi-Fi first in the service order (names must match networksetup -listallnetworkservices exactly):…
- ssh: connect to host port 22: Can't assign requested address (macOS, one server unreachable, others fine)On a Mac, ssh / nc / curl to ONE specific remote server fails instantly with Can't assign requested address, while the rest of the internet works.
- ModuleNotFoundError: No module named 'telnetlib' — removed in Python 3.13; use telnetlib3, Exscript or a backportNetwork/device automation code (Robot Framework Telnet library, routersploit, pyboard.py, custom scripts) fails on 3.13+ with ModuleNotFoundError: No module named 'telnetlib'.
- Talk to a device on 192.168.1.x via USB Ethernet when your Wi-Fi LAN is also 192.168.1.0/24 (macOS scoped route)A machine/controller with a fixed IP (e.g. Fix: Give the adapter an address on that subnet as an alias and add an interface-scoped route, then bind sockets to the interface: In Python, bind outgoing sockets to the…