Http Localhost 11501 __full__ Today

This is the most common cause. Before you can connect to localhost:11501 , something must be actively using that port.

Are you attempting to view a dashboard, or is this port associated with a different local development tool ?

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Vulnerabilities can exist in development servers themselves. For example, CVE-2020-11501 was a vulnerability in GnuTLS (a TLS/SSL library) where DTLS clients would send all-zero randomness in handshake messages, breaking security guarantees.

Here’s a quick guide to using http (from HTTPie) with localhost:11501 .