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[Solved]Connection to the current OMS could not be established

 included in Oracle
   590 words   3 minutes 
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Hello Folks, The last week one of our customer wanted to automate their Oracle backup systems. As an Oracle environment, customer has Oracle 12c. Luckily Oracle 12c designed for the Cloud. Oracle Enterprise Manager is the graphical interface for managing all of  Oracle database environment. Oracle Enterprise Manager has also command line interface which we need to automate their systems. emcli– Enterprise Manager Command line interface is the tool which enables users to access Enterprise Manager functionality through a command-line. It has a two modes of operation. One is interactive mode and other one is Script Mode. In this post, It will be used interactive mode. Installation of the emcli for interactive mode: emcli is a jar package that you need to download, install and setup. You can download the jar package from your OMS.

wget --no-check-certificate
https://<your_em_host:port>/em/public_lib_download/emcli/kit/emclikit.jar

Before install it, do not forget to set JAVA_HOME environment variable.

$export JAVA_HOME=/your/Java/path
#for me
$export JAVA_HOME=/app/jdk1.8.0_162

Installation

$JAVA_HOME/bin/java -jar emclikit.jar -install_dir=<em_cli_home_dir>
#for me
$JAVA_HOME/bin/java -jar emclikit.jar -install_dir=/app/emcli

Setting up emcli Normally Setting up emcli is very easy step. But as always Murphy on the scene :). I got an error during the setup process.

[email protected]:~$ ./emcli setup -url=https://10.10.18.40:7799/em -username=auto -password="pass"  -dir=/app/emcli
Oracle Enterprise Manager 12c Release 5.
Copyright (c) 1996, 2015 Oracle Corporation and/or its affiliates. All rights reserved.

Error: Connection to the current OMS could not be established. Check the log files for further details.
Log file location is : /app/emcli/.emcli/.emcli.log

/app/emcli/.emcli/.emcli.log details

Apr 16, 2018 4:31:01 PM oracle.sysman.emCLI.verb.SetupVerb execute
SEVERE: HttpConnectionException
oracle.sysman.emCLI.omsbrowser.HttpConnectionException:
        at oracle.sysman.emCLI.omsbrowser.OMSBrowser.submitCommand(OMSBrowser.java:1319)
        at oracle.sysman.emCLI.omsbrowser.OMSBrowser.getPageInternal(OMSBrowser.java:748)
        at oracle.sysman.emCLI.omsbrowser.OMSBrowser.getPage(OMSBrowser.java:666)
        at oracle.sysman.emCLI.verb.LogoutVerb.doLogout(LogoutVerb.java:263)
        at oracle.sysman.emCLI.verb.SetupVerb.execute(SetupVerb.java:810)
        at oracle.sysman.emSDK.emCLI.CLIController.execute(CLIController.java:306)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at oracle.sysman.emCLI.StandAloneLaunchHandler.invoke(StandAloneLaunchHandler.java:363)
        at oracle.sysman.emCLI.StandAloneLaunchHandler.launch(StandAloneLaunchHandler.java:262)
        at oracle.sysman.emSDK.emCLI.CLIController.launch(CLIController.java:194)
        at oracle.sysman.emSDK.emCLI.CLIController.main(CLIController.java:184)
Caused by: javax.net.ssl.SSLException: Received fatal alert: close\_notify
        at sun.security.ssl.Alerts.getSSLException(Alerts.java:208)
        at sun.security.ssl.Alerts.getSSLException(Alerts.java:154)
        at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:2033)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1135)
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)
        at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:757)
        at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:123)
        at java.io.ByteArrayOutputStream.writeTo(ByteArrayOutputStream.java:167)
        at HTTPClient.HTTPConnection.sendRequest(HTTPConnection.java:3461)
        at HTTPClient.HTTPConnection.handleRequest(HTTPConnection.java:3373)
        at HTTPClient.HTTPConnection$10.run(HTTPConnection.java:3124)
        at HTTPClient.HTTPConnection$10.run(HTTPConnection.java:3115)
        at HTTPClient.HttpClientConfiguration.doAction(HttpClientConfiguration.java:729)
        at HTTPClient.HTTPConnection.doAction(HTTPConnection.java:5560)
        at HTTPClient.HTTPConnection.setupRequest(HTTPConnection.java:3115)
        at HTTPClient.HTTPConnection.Post(HTTPConnection.java:1119)
        at HTTPClient.HTTPConnection.Post(HTTPConnection.java:1073)
        at oracle.sysman.emCLI.omsbrowser.OMSBrowser.submitCommand(OMSBrowser.java:1298)

        ... 13 more

I suspected  SSL, which may be the SSL version problem. As Java 8 uses TLS1v2 as default. To  confirm that  I checked with openSSL tool.

$ openssl s_client -showcerts -connect 10.10.18.40:7799 -tls1_2 -debug

...(omitted)
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2


#I also tried with the tls1v1
openssl s_client -showcerts -connect 10.10.18.40:7799 -tls1_1 -debug

New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.1

I checked on Google; Oracle OMS uses TLSv1. To use TLS1v2 you need to patch it. As a workaround, I changed to my Java version from Java 8  to Java 7.

Set your JAVA_HOME for Java 7

$export JAVA_HOME=/app/jdk1.7.0_XXX

Installation of emcli with Java 7

/home/appadmin/jdk1.7.0_80/bin/java -jar emclikit.jar client -install_dir=/app/emcli
Oracle Enterprise Manager 12c Release 5.
Copyright (c) 2012, 2015 Oracle Corporation.  All rights reserved.

EM CLI client-side install completed successfully.
Execute "emcli help setup" from the EM CLI home (the directory where you have installed EM CLI) for further instructions.

Setting of emcli with Java 7. Do not forget to add -novalidate option.

[[email protected] emcli]$ ./emcli setup -url=https://10.10.18.40:7799/em -username=auto -password="pass"  -dir=/app/emcli  -novalidate
Oracle Enterprise Manager 12c Release 5.
Copyright (c) 1996, 2015 Oracle Corporation and/or its affiliates. All rights reserved.

After changed the Java version, It worked. You can ask Oracle for the patch number to use more secure version of the SSL version. Next post will be about taking a backup of the Oracle by using RMAN script with emcli tool.

Updated on 2018-04-20
 Oracle
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