Oracle: Connects with sqlplus but not from perl

I need to connect to an Oracle database from a perl script, it works in my tests and when using sqlplus, but not in production. This is a summary of the situation: Oracle 11g XE (11.2.0.2.0) : (Test environment) sqlplus : OK perl : OK Oracle 11g (11.2.0.4.0) : (Production environment) sqlplus : OK perl : ERROR The error reported is: Connect failed because target host or object does not exist I have triple checked the connection settings and are not mistaken. ### Specifics: - Test Server: Windows Server 2012 - Production Server: Windows Server (Unknown version) - Client: Ubuntu 18.04 x64 - Perl: 5.26.1 - SQL*Plus: 12.2.0.1.0 ### SQL*Plus command:

sqlplus64 user/password@192.168.0.1/db_sid

### Perl script:

#!/usr/bin/perl
use DBI;
$driver = "Oracle";
$sid    = "db_sid";
$host   = "192.168.0.1";
$dsn    = "DBI:$driver:sid=$sid;host=$host";
$dbh    = DBI->connect($dsn, "user", "password");

**Note**: I won't be able to test or execute anything in the production environment until next month. What could be the issue?