VMware VirtualCenter Server service not starting (v5.1)

Hi guys,

I have been pulling my hair trying to figure out how to fix the VirtualCenter Server service not starting problem. Initially I had thought the culprit was an SQL database which was maxing out the 10GB limit. I shrunk the database but the problem still persists. In a log file I can see error entries such as (full log file also attached):

2015-02-24T12:53:04.997+11:00 [04428 error 'Default'] Found dangling SSL error: [0] error:00000001:lib(0):func(0):reason(1)

2015-02-24T12:53:04.997+11:00 [04428 error 'Default'] Found dangling SSL error: [1] error:00000001:lib(0):func(0):reason(1)

2015-02-24T12:53:05.668+11:00 [04428 error 'win32vpxLdap_win32'] [LDAP Client] Failed to add LDAP entry CN=DD483CB7-1E6E-4AE7-AD60-5AAB3D0F3555,OU=ComponentSpecs,OU=Health,dc=virtualcenter,dc=vmware,dc=int: 0x68 (The object already exists.)

2015-02-24T12:53:05.684+11:00 [04428 error 'win32vpxLdap_win32'] [LDAP Client] Failed to add LDAP entry CN=DD483CB7-1E6E-4AE7-AD60-5AAB3D0F3555.vpxd,CN=DD483CB7-1E6E-4AE7-AD60-5AAB3D0F3555,OU=ComponentSpecs,OU=Health,dc=virtualcenter,dc=vmware,dc=int: 0x68 (The object already exists.)

2015-02-24T12:53:10.551+11:00 [04428 error 'Default'] [Auth] Failed to initialize: <class Sso::Fault::InvalidCredentials::Exception(sso.fault.InvalidCredentials)>

2015-02-24T12:53:10.551+11:00 [04428 error 'authvpxdAuthorize'] Failed to initialize security

I also followed this link:

VMware KB: Manually backing up and restoring the VMware vCenter Server 4.x and 5.x ADAM instance data

Any help will be much appreciated.

Many thanks

Dan