Ora-12170:tns:connect Timeout occurred

VM as Oracle server, client login prompt timed out, local connection using network connection is OK.

D:>sqlplus System/[email PROTECTED]//192.168.63.121:15021/PDB01

Sql*plus:release 11.2.0.4.0 Production on Thu Nov 10 12:00:05 2016

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Error:ora-12170:tns:connect Timeout occurred

1.cmd-----Ping IP address to see network problems, see if you can ping

2.cmd-----tnsping IP address (or the server's instance name SID) if the "TNS-12535: Operation timeout" is reported, the server-side firewall may not be turned off

3.cmd----Netstat-na See if Port 1521 is off, set 1521 port as exception if you turn off firewall settings in Windows XP

4.cmd----LSNRCTL Status Lsnrctl is an abbreviation for the Listener-control listener to view the status of the listener

5. Turn off the firewall http://jingyan.baidu.com/article/93f9803f01a28fe0e46f55f3.html

Ora-12170:tns:connect Timeout occurred