This was caused by an incorrect JRE library. Possibly some product installation updated the JRE libraries incorrectly
Issue/Introduction
Not-able-to-login-AMX-admin-GUI
Environment
All Supported OS Platforms
Resolution
1. Take a backup of the corrupted JRE folder (<tibco_home>\tibcojre, or <tibco_home>\tibcojre64).
2. Replace the corrupted JRE folder with a JRE folder from a working environment. Please make sure that the JRE byte mode (32-bit or 64-bit), version, and update number are the same in the working JRE folder, and make sure the new JRE has the same configuration as the OLD JRE (just like "java.security","cacerts" file under <JRE_Home>\lib\folder, etc).
3. Restart the environment and check if the user can log in to AMX Admin GUI successfully.