Without reading your code too close, I think it is because your decon_server subroutine gets called too early:
my %options = (
...
"decon" => \&decon_server,
);
...
die_usage()
if (!GetOptions(%options));
decon_server will get called from within GetOptions(), which is too early since none of the connection setup has happened yet.
I would suggest that the approach of setting a flag, as used in the other options, is likely better:
my %options = (
...
"decon" => \my $do_decon_server,
);
...
die_usage()
if (!GetOptions(%options));
...
if( $do_decon_server ) {
decon_server();
};
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