KB42205: "An error occurred during authentication. Please contact your administrator: LDAP Server error (19): Constraint violation." error message appears when connecting with LDAP authentication in MicroStrategy 9.x

SYMPTOM:
When trying to connect to the Intelligence Server using LDAP Authentication, the following error message is seen:
 
 

"An error occurred during authentication. Please contact your administrator: LDAP Server error (19): Constraint violation." 

 
CAUSE:
Typically, LDAP error 19 is returned at any time the supplied credentials violate the constraints defined within the LDAP server.  This error originates from the LDAP server and not Strategy.  Two common instances where this error can occur are:

• Adding an attribute value that doesn't meet the size limitations.  For example, an attribute is defined with an upper size limit of 8 characters.  A constraint violation is thrown, if a value of '123456789' is entered.
• Adding a second value to an attribute that only allows one value to be present. 

ACTION: 
At the connection stage, this is caused by the credentials for the authentication user.  For an individual user, it can happen at login. Verify that the correct user and password are used for authentication.
 
If the issue persists, request the LDAP Administrator check the credentials in the system.  If usernames or passwords are violating constraints, correct them appropriately.