Hi Sunish,
The WAAE instaler executes the following sqlplus command to verify the DB connectivity.
sqlplus user/password@ServerName:PortNumber/ServiceName as SYSDBA
For example:
sqlplus sys/autosys@test-205309:1521/ORCL as SYSDBA
If it is not successful then it prints error: The specified database port is not valid. Specify another port.
Try the aforementioned sqlplus syntax and see if it comes back successful. A couple more things to try:
1) Ensure the sqlplus the installer uses is the same as you try in case there are multiple version of Oracle clients installed.
2) If the password has special characters such as $,!,@,#, etc., then try with a simple password.
3) I found this article related to sqlplus on SuSE 12, it may be relevant.
Thanks,
Chandru