Connecting to data base

hi all,
i am using two data base servers i have same table definations in both data base servers (new one is replica of old server table defination)

both data base servers have same username ,password,database name

i added both servers infomation in tnsnames.ora file
the ip address are like *.*.15.* and *.*.16.* having same port number

i connected to one data base server (*.*.15.*)
and i opened new instance from file menu i trying to connected to another one(*.*.16.*) but it is not connected and it is connecting to only (*.*.15.*)

but in sql developer while i creating connection i have option to choose host

how can i in plsql developer ?
 
Can you send me your tnsnames.ora file by e-mail? My guess is that it might not be configured correctly.
 
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