It looks like you have the "remoteport=localhost:nnn" set in an environment variable called PERLDB_OPTS or possible a config file (called ./.perldb or ~/.perldb) containing parse_options("remoteport=localhost:nnn").

See perldebug and/or 

perl -de1
h O
...
   RemotePort          Remote hostname:port for remote debugging
...

[download]

For (a little) more information.

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In reply to Re: Debugger failing to connect to localhost by BrowserUk
in thread Debugger failing to connect to localhost by smitz

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