Summary:Start with the first layer that changes: DNS, split tunneling, IPv6, system proxy settings, the browser, or the current network path.
What this usually means on a live network
Connection problems are rarely a single mysterious fault. They are more often the result of DNS, split tunneling, IPv6, system proxy settings, or the current network path being slightly out of line with each other.
Test the closest layer first
Before you change several settings, compare another network, another browser, or another device. That quickly tells you whether the problem stays on the device, follows the current connection, or only appears in one service.
Change one thing at a time
When the issue involves routing or network behavior, changing too many layers at once only hides the real cause. Keep one clean baseline, then test one adjustment at a time until the symptom clearly moves.
Start here
- Compare another network before you change more settings.
- Change only one routing or DNS layer at a time.
- Write down when the symptom appears and whether it follows one device or all of them.