oracle11g - Oracle client server connectivity issue -

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i have installed multiple oracle (homes) clients on server including 10g , 11g . when using sql plus 11g client getting error "tns:protocol adapter error." checked tnsnames.ora resolve issue. found tnsnames.ora in network/admin directory 11g home having values identical different tnsnames.ora on different server able connect server. know default tnsnames.ora entire system not sure can find it. tried tnsping orcl got error "tnsping not recognized internal or external command". new oracle, please help


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