io error network adapter

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io error network adapter

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Hi,

 

I am following this link to connect to cloud database service.

 

http://www.oracle.com/webfolder/technetwork/tutorials/obe/cloud/dbaas/obe_dbaas_QS/oracle_database_cloud_service_dbaas_q…

 

I get io error...network adapter error when i try to connect to cloud database service. I tried to ping public IP .....it is failed with Request timeout.

 

I have not defined any entry in tnsnames.ora file.

 

How to solve this ?