将Postgresql 9.1升级到版本9.6-端口5432上的TCP / IP连接？错误

Question

我已经从postgres版本9.1升级到postgres 9.6，当我尝试连接到服务器上的数据库时，我收到以下错误：

psql: could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?

当我运行pg_clusters时，它会显示：

9.6 main    5432 online postgres /var/lib/postgresql/9.6/main /var/log/postgresql/postgresql-9.6-main.log

当我查看/etc/postgresql/9.6/main/postgresql.conf时，它最初显示：

listen_addresses = '*'          # what IP address(es) to listen on;
                                        # comma-separated list of addresses;
                                        # defaults to 'localhost', '*' = all
                                        # (change requires restart)
port = 5433                             # (change requires restart)
max_connections = 100                   # (change requires restart)

但我现在已将端口更改为5432但这似乎没有解决问题。我需要采取另一个步骤吗？

由于