TNS - 12535 - Connection Operation Time Out

i m getting this error again and again. to overcome this problem, i have searched
CONNECT_TIMEOUT parameter to asign '0' zero vaue, to get higher higher time in listner.ora, but there is no any such parameter in it.(as suggested my teacher) hence i reconfigured my listner, the said prob get solved. but the next day i found the same error. what should be do? is there any solution?
thanx in advance

from the client (using dos command prompt)
tnsping instance_name
Also check your tns_names file on the client and make certain you are pointing at the correct machine. Check the machine and make certain the listener is listening for the correct alias.
Something is not working correctly.
Are the other clients having the same problems or are they able to connect?
Wayne

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