1. You could try to run an etautil command on the Provisioning Server to reset the password.For example:
etautil -u USER -p PWD -DYN update 'eTNamespaceName=UNIX v2' eTDYNDirectory eTDYNDirectoryName='My_Endpoint_Name' to eTDYNPassword='New_Endpoint_Password'
The above does not work on all the endpoint types (eg. HPUX) so if it does not work:
2. Use an ldapbrowser to connect to the Provisioning Repository router (i.e. data later) which is running on the Provisioning Server machine and listening on port 20391 using the Bind DN of "eTDSAContainerName=DSAs,eTNamespaceName=CommonObjects,dc=etadb" with the installation password and then navigate to the object "eTDYNDirectoryName=My_Endpoint_Name,eTNamespaceName=UNIX v2,dc=im,dc=etadb" and enter the clear-text new password into the attribute eTDYNPassword.
After this try the etautil command again to re-enter the password value so that we re-save the password as an encrypted value.