Getting error while creating a new user (by using default AD workflow..) ???

I am not able to create a new user in one of the OU created using workflow ...And I am getting the below errors .. :-

1st one is :- (LdapErr)

Unable to create a new user: InternalError: Failed to create user account... [LDAP: error code 53 - 00002035: LdapErr: DSID-0C090BF4, comment: Operation not allowed through GC port, data 0, v1db0 ] (Dynamic Script Module name : createUser#1) (Dynamic Script Module name : createUser#4)

2nd one is :- (SVCErr)

Unable to create a new user: InternalError: Failed to create user account... [LDAP: error code 53 - 0000052D: SvcErr: DSID-031A120C, problem 5003 (WILL_NOT_PERFORM), data 0

] (Dynamic Script Module name : createUser#1) (Dynamic Script Module name : createUser#4)

Please help me with that .. .???

Thanks .. !!