Yes, it is possible to change passwords directly in the registry.xml file, but it is not recommended. The recommended approach is to use the GUI. However, if you still decide to modify the .xml files, you must update the APWMQ and permits database user password variables. The APWMQ database user password variable is dbPassEnc, and the permits database user password variable is permitsDbPassEnc. Additionally, you need to ensure that these passwords are encrypted. Encryption can be performed using the following command: java -jar nsqcmkafka.jar -p password or the command mentioned in this article.