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		Hi Arslan,
 We could not connect to database  give error like below
 
 
 oracle 11.2.0
 os windows
 
 
 PROD =
 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.4.111)(PORT = 1521))
 (CONNECT_DATA =
 (SERVER = DEDICATED)
 (SERVICE_NAME = prod)
 )
 )
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 Enter user-name: sigtasad/sigtas@prod
 ERROR:
 ORA-12170: TNS:Connect timeout occurred
 
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 C:\Users\arsala>tnsping prod
 
 TNS Ping Utility for 64-bit Windows: Version 11.2.0.4.0 - Production on 16-APR-2
 018 15:25:56
 
 Copyright (c) 1997, 2013, Oracle.  All rights reserved.
 
 Used parameter files:
 C:\app\arsala\product\11.2.0\dbhome_1\network\admin\sqlnet.ora
 
 
 Used TNSNAMES adapter to resolve the alias
 Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.
 4.111)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = prod))
 )
 TNS-12535: TNS:operation timed out
 
 C:\Users\arsala>ping 192.168.4.111
 
 Pinging 192.168.4.111 with 32 bytes of data:
 Reply from 192.168.4.111: bytes=32 time=8ms TTL=125
 Reply from 192.168.4.111: bytes=32 time=4ms TTL=125
 Reply from 192.168.4.111: bytes=32 time=29ms TTL=125
 Reply from 192.168.4.111: bytes=32 time=13ms TTL=125
 
 Ping statistics for 192.168.4.111:
 Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
 Approximate round trip times in milli-seconds:
 Minimum = 4ms, Maximum = 29ms, Average = 13ms
 
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