How to change the password for the ldap domain that was previously declared in TIBCO Data Virtualization (TDV), but without using the browser-based manager tool?  

You can utilize our native soap operation seen in the Studio as:  /services/webservices/system/admin/user/operations/updateDomain

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Note:  for help on the attribute names and types to use as the input parameters, you can run:
/services/webservices/system/admin/user/operations/getDomainTypeAttributeDefs

with this type of input request:
<user:getDomainTypeAttributeDefs xmlns:user="http://www.compositesw.com/services/system/admin/user">
  <user:domainType>LDAP</user:domainType>
</user:getDomainTypeAttributeDefs>
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For the updateDomain operation, this is an example of a soap envelope input to change the password for a TDV ldap domain named "yourldapdomainname" to use the new password "mynewpassword".

<user:updateDomain xmlns:user="http://www.compositesw.com/services/system/admin/user" xmlns:common="http://www.compositesw.com/services/system/util/common">
  <user:domainName>yourldapdomainname</user:domainName>
  <user:annotation></user:annotation>
  <user:attributes>
    <common:attribute>
      <common:name>a_domain_admin_new_password</common:name>
      <common:type>PASSWORD_STRING</common:type>
      <common:value>mynewpassword</common:value>
    </common:attribute>
  </user:attributes>
</user:updateDomain>
 

How to change the password of an LDAP domain user through a soap call in TIBCO Data Virtualization?