How to connect to Oracle 11g using "Navicat for Oracle"?
You need to change port 1158 to 1521 in your connection properties.

Oracle's listener for database connections runs on port 1521 by default.

Port 1158 is the web listener for Database Control, a webgui for managing the database.

In addition, the servicename should be something like "database.domain.com", or you can try using SID and specifying ORCL.