BIP3144
Severity
30 : Severe error
Message
An error has occurred during HTTP listener startup: the specified TCPIP port (<insert_0>) is already in use.
Explanation
The HTTP listener needs to bind to a TCPIP port for correct operation to be possible. The broker-specific TCPIP port number <insert_0> is in use by another application.
Response
Stop other applications from using the specified port, or change the broker-specific port.