oralce11g agent与oms无法连接

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 11.1.0.1.0 

Copyright (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。