Linking vCenter 5.1

Hello Experts,

I am having big time trobule in linking 2 vSphere 5.1 vCenter servers. Below is the summary.

I have 2 vCenter servers 5.1 Namely

1.lab1.vm.com
2.lab2.vm.com

 Both vCenters are in same domain and DNS is also looks good.

Now,
I have installed Primary SSO on Lab1.vm.com and I have used lab1.vm.com SSO credentials to join my Lab2.vm.com so that they can be linked. I have gone thorugh below documents.

http://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.vcenterhost.doc%2FGUID-7634B78B-07E5-44EC-B5A0-CBEE842A20FD.html

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2034074

Lab2.vm.com SSO is in Mulitsite mode.

Everything looks good , but when I try using vSphere client to login to my lab2.vm.com it shows me an error message

"You Don't have permission to login to this server : <lab2.vm.com>

but when I try logging in to lab1.vm.com  - it logs me in , but throws an message

"Unable to connect to lab2.vm.com"

I refererred below documents , but it did not help me

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2035758

Looks like - Liked mode is deleting my vCenter permission , I am not sure whether there is an default account exists from where I can login and add teh vCenter permission (AD Group) once again.

Can anyone let me know , how to come over from this dilemma...? if some has steps to be followed  please let me know.

Its been a long time and I see there is not much information in internet as well.

Thanks,

-Prashant Girennavar.