c:\Program Files\PostgreSQL\9.5\bin>createdb.exe testdb
createdb: could not connect to database template1: could not connect to server:
Connection refused (0x0000274D/10061)
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
could not connect to server: Connection refused (0x0000274D/10061)
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?