Oracle E-Business Suite Release 11.5.10 introduced support for the Oracle Net security feature, tcp.validnode_checking, which is used to prevent unauthorized Oracle Net access (for example via SQL*Plus) to the Applications database. If a node or PC is not registered, the connection attempt will fail with the error ORA-12537: TNS: connection closed.
在sqlnet.ora文件中将tcp.validnode_checking的值设为no。然后重启数据库与服务就可以了。
./proddb/9.2.0/network/admin/PROD_lxd/sqlnet.ora
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