You can see exactly what program is trying to use port 11501 by using your system's terminal. netstat -ano | findstr :11501 On Mac/Linux (Terminal): lsof -i :11501 3. Check Your Firewall Sometimes, security software blocks internal ports. Temporarily disable your Firewall to see if the page loads. Add an "Inbound Rule" to allow traffic on port 11501. 4. Clear Browser Cache
Your computer’s "loopback" address (127.0.0.1). It allows software to talk to other software on the same machine without an internet connection.
Sometimes a program runs locally but binds explicitly to the literal IP address 127.0.0.1 instead of the broader string localhost , or vice versa. If your computer's internal hosts file has been altered, typing localhost might fail while navigating directly to http://127.0.0.1:11501 works perfectly. Security Implications localhost11501
is not a "standardized" port assigned by the IANA (Internet Assigned Numbers Authority). This means it is typically used by custom enterprise software, specific developer tools, or niche background services. Common Applications Using Port 11501
Understanding localhost:11501 : A Guide to Local Development Port 11501 You can see exactly what program is trying
Or using netstat :
Docker adds an extra layer of complexity to the concept of localhost . Inside a Docker container, localhost and 127.0.0.1 refer to the , not your host computer. This is a common cause of confusion when a containerized application tries to access another service running on your main machine (e.g., a database like MariaDB on port 11501 ). Temporarily disable your Firewall to see if the page loads
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First, check if a process is actively listening on port 11501. powershell Get-NetTCPConnection -LocalPort 11501 Use code with caution. On macOS / Linux (Terminal): sudo lsof -i :11501 Use code with caution.