I tried to create a connection in SQL Developer with a remote SQL Server database. The first steps to configure Oracle SQL Developer are described in the introductory article to SQL Developer, and had already done some testing with a SQL Server installed on the same machine as SQL Developer, but when I tried to do it with a remote BD SQL Server I found some additional difficulty that I think it's interesting to comment.

MySQL has some special features when making a connection from a remote client that if we do not know can complicate access to a MySQL database from a different machine that hosts the database.

With other databases such as Oracle or SQL Server, once that no firewall or anything like that prevents us from the client machine access to the server, using normally data acces from a database user we can 'enter'.

With MySQL, although access to the port, usually 3306, is open, the database can be configured to shut out external connections, and the result is the same as if the port was closed by a firewall..