在一台机器中安装了DB2 ，然后试一下端口联通性：
[root@db2 ~]# telnet 202.116.193.121 50000
Trying 202.116.193.121...
Connected to 202.116.193.121 (202.116.193.121).
Escape character is ‘^]‘.
方法是：
1、ctrl+]
2、quit
刚才测试结果如下：
[root@db2 ~]# telnet 202.116.193.121 50000
Trying 202.116.193.121...
Connected to 202.116.193.121 (202.116.193.121).
Escape character is ‘^]‘.
^]
telnet> quit
Connection closed.