Check that Burp's proxy listener is active - Port Swigger
Summary: PortSwigger's documentation explains that Burp's proxy listener is a local HTTP proxy server that intercepts browser traffic, and that Burp creates a single listener on port 8080 of the loopback interface by default. It instructs users to confirm the 127.0.0.1:8080 entry shows the Running checkbox selected in the Proxy listeners panel, and if not, to restore defaults or bind the listener to a different port when 8080 is already in use.
What you should know: The entire interception workflow depends on that one listener being active, so a port already claimed by another application silently breaks monitoring until someone checks the Running checkbox or rebinds to a free port.
Read the original at PortSwigger Research ↗
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