LDAP Map users to roles

[Raghav2384]

Working LDAP where i can map LDAP groups to roles.
[XYZ Corporate AD]
SSLEnabled = 1
anonymous_referrals = 1
bindDN = CN=a1dpsapacheuser,OU=Administrative,DC=CORP,DC=XYZ,DC=com
bindDNpassword = password
charset = utf8
emailAttribute = mail
groupBaseDN = OU=Groups,OU=Location Corporate,OU=ABC,DC=CORP,DC=XYZ,DC=com
groupMappingAttribute = dn
groupMemberAttribute = member
groupNameAttribute = cn
host = x.x.x.x
nestedGroups = 0
network_timeout = -1
port = 636
realNameAttribute = givenname
sizelimit = 1000000
timelimit = 29
userBaseDN = OU=ABC,DC=CORP,DC=XYZ,DC=com
userNameAttribute = samaccountname

[roleMap_XYZ Corporate AD]
admin = XYZ - Admin Splunk Distribution
splunkuser = GlobalUsers

[authentication]
authSettings = XYZ Corporate AD
authType = LDAP

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Trying to achieve, LDAP map users to Roles. I have followed
http://answers.splunk.com/answers/43842/mapping-ldap-user-to-roles-matched-groups-are-not-found-in-r... &
http://docs.splunk.com/Documentation/Splunk/6.2.0/Security/ConfigureLDAPwithconfigurationfiles as is but no luck. Here's the config i came up with

[XYZ Corporate AD]
SSLEnabled = 1
anonymous_referrals = 1
bindDN = CN=a1dpsapacheuser,OU=Administrative,DC=CORP,DC=XYZ,DC=com
bindDNpassword = password
charset = utf8
emailAttribute = mail
groupBaseDN = OU=ABC,DC=CORP,DC=XYZ,DC=com
groupBaseFilter = (|(samaccountname=*))
groupMappingAttribute = samaccountname
groupMemberAttribute = samaccountname
groupNameAttribute = samaccountname
host = x.x.x.x
nestedGroups = 0
network_timeout = -1
port = 636
realNameAttribute = cn
sizelimit = 1000000
timelimit = 29
userBaseDN = OU=ABC,DC=CORP,DC=XYZ,DC=com
userNameAttribute = samaccountname

[roleMap_XYZ Corporate AD]
newadmin = rgomatha

[authentication]
authSettings = XYZ Corporate AD
authType = LDAP

And i can't login. Is it because we have too many groups? I am sure more than 1000! What am i doing wrong?

Thanks in advance!
Regards,
Raghav