I'm having an issue with SQL Developer 17.4. It does not connect to my DB.

This is my connection setting.

However sqlplus connects to the same DB from the same computer.
sqlplus64 st_imig_user/******@//10.103.18.71:1521/BuildDB
SQL*Plus: Release 12.2.0.1.0 Production on Thu Jan 25 22:10:00 2018
Copyright (c) 1982, 2016, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
The first time after installing 17.4 the connection worked but not since.