DB2 LUW : Why does db2rbind xxxx -l rbind.log fail with "Database Manager cannot be started."?

Body

QUESTION:
We are creating a new system on AIX 7.1 / DB2 WSE 10.5 FP8. But
db2rbind xxxx -l rbind.log failed with "Database Manager cannot be started."  
There is a user who gets this error however there also a user who can run it without the error.
Here is the associated db2diag.log message:
------------------  
2017-01-04-15.31.32.135117+540 I483628A844          LEVEL: Warning  
PID     : 12845180             TID : 1              PROC : db2start  
INSTANCE: db2inst1              NODE : 000  
HOSTNAME: myhost1
EDUID   : 1  
FUNCTION: DB2 UDB, base sys utilities, sqlestrt.C::main, probe:1636  
MESSAGE : Error encountered during db2start execution  
DATA #1 : unsigned integer, 4 bytes  
32  
DATA #2 : unsigned integer, 4 bytes  
1  
DATA #3 : SQLCA, PD_DB2_TYPE_SQLCA, 136 bytes  
 sqlcaid : SQLCA     sqlcabc: 136   sqlcode: -1366   sqlerrml: 16
 sqlerrmc: IBMLDAPgroups 7  
 sqlerrp : SQLESTRT  
 sqlerrd : (1) 0x805C0197      (2) 0x00000197      (3) 0x00000000  
           (4) 0x00000000      (5) 0x00000000      (6) 0x00000000  
 sqlwarn : (1)      (2)      (3)      (4)        (5)       (6)  
           (7)      (8)      (9)      (10)        (11)  
 sqlstate:  
------------------  

Why does db2rbind xxxx -l rbind.log fail with "Database Manager cannot be started."?

ANSWER:
Generally speaking, the above message, "-1366" (SQL1366N) and the keyword
"IBMLDAPgroups 7", most likely is caused by unexpected LDAP configuration.  So it might
be suggested to check LDAP configuration to see if there any problem or not with
referencing below page:

V10.5, LDAP-based authentication and group lookup support

It it does not help, it might be needed to collect more information or data, such as
db2trc and suggested to open a PMR to clarify the reason why.

SQL1366N

Here is one of helpful links to collect data for further investigation.
Collecting data: Read first for DB2 for Linux, UNIX, and Windows products

Here is one of good articles, would be recommended to review:
DB2 FAQ - Frequently Asked Questions about DB2 for Linux, UNIX and Windows

Here is the main page for all DB2 versions' manuals.
IBM DB2 database product documentation

Hope this helps.