Frameworks sometimes assign incremental ports when the default is taken. For example:
You need a self-signed certificate and a local HTTPS server (e.g., mkcert + http-server -S -p 11501).
If you see traffic on this port or are unsure what is running on it, you can identify the process using standard command-line tools:
On Windows (Command Prompt):
netstat -ano | findstr :11501
This will return the Process ID (PID). You can then find the PID in Task Manager to see which program owns the connection.
On Linux / macOS (Terminal):
lsof -i :11501
This displays the command name and PID of the process using the port. localhost11501
Because it’s a non-standard port, malicious software occasionally uses high-numbered ports to hide from basic scans. However, localhost11501 is rarely used for malware unless you see unusual outbound connection attempts.
Safety note: Always verify what process is listening on port 11501 before trusting it.
To understand localhost11501, one must deconstruct its two parts: This will return the Process ID (PID)
netstat -ano | findstr :11501
Look for LISTENING and note the PID (Process ID). Then:
tasklist | findstr <PID>
localhost is a hostname that resolves to the IPv4 address 127.0.0.1 (or IPv6 ::1). It represents your local machine. Any traffic sent to localhost never leaves your computer—it is routed internally via a loopback network interface.
Cause: Another process is already bound to 11501.
Fix: This displays the command name and PID of
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