2台服务器，一台装GC，另一台安装agent后，发现启动运行都是正常的，但是oms就是找不到agent主机
oracle@devdb1 bin]$ ./emctl status agent
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
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Agent Version : 11.1.0.1.0
OMS Version : 11.1.0.1.0
Protocol Version : 11.1.0.0.0
Agent Home : /u01/app/oracle/product/middleware/agent11g
Agent binaries : /u01/app/oracle/product/middleware/agent11g
Agent Process ID : 15993
Parent Process ID : 15960
Agent URL : http://devdb1:3872/emd/main/
Repository URL : https://oms:7799/em/upload/
Started at : 2015-08-11 21:01:32
Started by user : oracle
Last Reload : 2015-08-11 21:05:23
Last successful upload : (none)
Last attempted upload : (none)
Total Megabytes of XML files uploaded so far : 0.00
Number of XML files pending upload : 41
Size of XML files pending upload(MB) : 14.62
Available disk space on upload filesystem : 27.21%
Last attempted heartbeat to OMS : 2015-08-11 21:05:42
Last successful heartbeat to OMS : unknown
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从上面可以看出 虽然agent正常运行，但是无法连接到oms
[oracle@devdb1 bin]$ ./emctl secure agent
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
Agent successfully stopped... Done.
Securing agent... Started.
Enter Agent Registration Password :
Agent successfully restarted... Done.
Securing agent... Failed.
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[oracle@rac1 ~]$ $AGENT_HOME/bin/emctl upload agent
Oracle Enterprise Manager 10g Release 5 Grid Control 10.2.0.5.0.
Copyright (c) 1996, 2009 Oracle Corporation. All rights reserved.
---------------------------------------------------------------
EMD upload error: uploadXMLFiles skipped :: OMS version not checked yet.
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oracle@devdb1 bin]$ ./emctl verifykey
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
-----------------------------------------------------
verifykey: Successfully Completed communication with agent
EMD pingOMS error: SSL handshake failure between OMS https://oms:7799/em/upload/ and Agent , err -10
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最后发现是SSH握手失败，而造成握手失败的原因是，2台服务器的日期不一起，修改日期后，通信正常了。