To address SHA256 warnings, such as those reportes from the command below:
emctl config agent addinternaltargets Oracle Enterprise Manager Cloud Control 13c Release 3 Copyright (c) 1996, 2018 Oracle Corporation. All rights reserved. 2020-05-19 16:06:07,167 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,174 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,174 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite ECDHE_RSA_WITH_AES_128_GCM_SHA256, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,174 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite RSA_WITH_AES_128_GCM_SHA256, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,174 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite RSA_WITH_AES_256_GCM_SHA384, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,174 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite ECDHE_RSA_WITH_AES_256_GCM_SHA384, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,175 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite DHE_RSA_WITH_AES_128_GCM_SHA256, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,175 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite DHE_DSS_WITH_AES_128_GCM_SHA256, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,175 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite DHE_DSS_WITH_AES_256_GCM_SHA384, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,175 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite DHE_RSA_WITH_AES_256_GCM_SHA384, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,175 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite DH_DSS_WITH_AES_128_GCM_SHA256, which is not supported for SSLContext TLSv1.2 2020-05-19 16:06:07,175 [main] WARN oracle.sysman.gcagent.comm.agent.http.SSLInit - User requested cipher suite ECDH_ECDSA_WITH_AES_128_GCM_SHA256, which is not supported for SSLContext TLSv1.2
Process as follow:
emctl setproperty agent -name SSLCipherSuites -value TLS_RSA_WITH_AES_128_CBC_SHA:TLS_RSA_WITH_AES_256_CBC_SHA
Then
./emctl stop agent ./emctl start agent ./emctl config agent addinternaltargets ./emctl secure agent ./emctl config agent listtargets