The value of the variable *default-ide-remote-debugging-server-port*
is the default port for start-ide-remote-debugging-server and the initial default for configure-remote-debugging-spec and with-remote-debugging-spec.
Note that if you change the port number on one side you must change it to the same number on the other side.
start-ide-remote-debugging-server
configure-remote-debugging-spec
with-remote-debugging-spec
Remote debugging
LispWorks User Guide and Reference Manual - 20 Sep 2017