Hi Vibin Vincent,
The given error is not from the Ignio product. It is a generic thrown from Oracle some of the reasons are given below.
Check your connection entry in the tnsnames.ora file, especially the values of hostname, port number.
Is your hostname is pingable from the target server? if not resolve it.
Have you given the proper port number in the tnsnames.ora file for the connection entry?
Do Ignio user has proper read privilege on the tnsnames.ora file?
Is the port is opened in the firewall?
Is the port is not blocked by the antivirus?