Hi Rick,
While following steps you suggested, I took backup of SSO, stopped SSO service on SSOVM01.
Ran autorun.exe of vcenter 5.1 for SSO installation on my vcenter server "VCVM01" as per kb.vmware.com/kb/2034928.
SSO installed successfully.
I tried installing Inventory service on my vcenter server "VCVM01" but its failing with following error in ssoreg.log file :-
C0B9-4A86-9207-E64448CBA66B}\certs -d https://VCVM01.ads.mckinsey.com:7444/lookupservice/sdk -u admin@System-Domain -p *****
[2014-09-04 08:27:09,745 main INFO com.vmware.vim.install.impl.RegistrationProviderImpl] Intializing registration provider...
[2014-09-04 08:27:09,746 main INFO com.vmware.vim.install.impl.RegistrationProviderImpl] Getting SSL certificates for https://VCVM01.ads.mckinsey.com:7444/lookupservice/sdk
[2014-09-04 08:27:10,183 main DEBUG com.vmware.vim.install.impl.RegistrationProviderImpl] Establishing socket connection to VCVM01.ads.mckinsey.com/157.191.229.152:7444. Timeout is 60000
[2014-09-04 08:27:10,320 main DEBUG com.vmware.vim.install.impl.RegistrationProviderImpl] Creating VMODL client for LookupService
[2014-09-04 08:27:11,155 main DEBUG com.vmware.vim.install.impl.RegistrationProviderImpl] Getting the locations of SSO admin server and STS
[2014-09-04 08:27:11,259 main INFO com.vmware.vim.install.impl.RegistrationProviderImpl] Getting SSL certificates for https://SSOVM01.ads.mckinsey.com:7444/sso-adminserver/sdk
[2014-09-04 08:27:11,260 main DEBUG com.vmware.vim.install.impl.RegistrationProviderImpl] Establishing socket connection to SSOVM01.ads.mckinsey.com/157.191.229.149:7444. Timeout is 60000
[2014-09-04 08:27:12,272 main ERROR com.vmware.vim.install.impl.RegistrationProviderImpl] Unable to connect to server
[2014-09-04 08:27:12,274 main DEBUG com.vmware.vim.install.impl.RegistrationProviderImpl]
java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:564)
at com.vmware.vim.install.impl.RegistrationProviderImpl.getSslCertificates(RegistrationProviderImpl.java:312)
at com.vmware.vim.install.impl.RegistrationProviderImpl.initialize(RegistrationProviderImpl.java:236)
at com.vmware.vim.install.impl.RegistrationProviderImpl.<init>(RegistrationProviderImpl.java:133)
at com.vmware.vim.install.RegistrationProviderFactory.getRegistrationProvider(RegistrationProviderFactory.java:143)
at com.vmware.vim.install.RegistrationProviderFactory.getRegistrationProvider(RegistrationProviderFactory.java:60)
at com.vmware.vim.install.cli.commands.CommandArgumentsParser.createServiceProvider(CommandArgumentsParser.java:253)
at com.vmware.vim.install.cli.commands.CommandArgumentsParser.parseCommand(CommandArgumentsParser.java:99)
at com.vmware.vim.install.cli.commands.CommandFactory.createValidateLsCommand(CommandFactory.java:36)
at com.vmware.vim.install.cli.RegTool.process(RegTool.java:86)
at com.vmware.vim.install.cli.RegTool.main(RegTool.java:33)
[2014-09-04 08:27:12,277 main ERROR com.vmware.vim.install.cli.commands.CommandArgumentsParser] Unable to connect to server
[2014-09-04 08:27:12,278 main INFO com.vmware.vim.install.cli.RegTool] Return code is: ServiceNotResponding
So it is still trying to look for SSL certificate from old SSO server "ssovm01" rather looking in new one "vcvm01"
Could you please help to resolve this?