本文解决升级到12c后E-Business Suite中出现的JDeveloper连接失败问题，具体表现为ORA-28040错误：未找到匹配的身份验证协议。通过调整sqlnet_ifile.ora文件中的SQLNET.ALLOWED_LOGON_VERSION_SERVER参数来解决此问题。
Log: Adcfgclone.pl tier apps Errors with RC-40201: Unable to connect to Database
metalink doc:
After a Database Upgrade to 12c for E-Business Suite, JDeveloper Connections Fail With Error "ORA-28040 no matching authentication protocol" (Doc ID 2125856.1)
If on E-Business Suite Release 12.1, ensure that thesqlnet_ifile.ora has the line:
SQLNET.ALLOWED_LOGON_VERSION_SERVER = 8 (if the initialization parameter SEC_CASE_SENSITIVE_LOGON is set to FALSE)
SQLNET.ALLOWED_LOGON_VERSION_SERVER = 10 (if SEC_CASE_SENSITIVE_LOGON is set to TRUE)
SQLNET.ALLOWED_LOGON_VERSION_SERVER = 8
SQLNET.ALLOWED_LOGON_VERSION_CLIENT = 8
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