Can you confirm the contents of your GUACAMOLE_HOME (/etc/guacamole unless you changed it) sub-directories
/etc/guacamole/lib/ mysql-connector-j-9.2.0.jar /etc/guacamole/extensions/ guacamole-auth-jdbc-base-1.6.0.jar guacamole-auth-jdbc-mysql-1.6.0.jar guacamole-auth-json-1.6.0.jar guacamole-auth-ldap-1.6.0.jar guacamole-auth-totp-1.6.0.jar or whatever combination of AUTH jar files you need. If you are using MariaDB you must have at least the jdbc-base and jdbc-mysql jar files in the /extensions/ directory, and you must use the mysql connector rather than the mariadb one, and it must be in the /lib/ directory Vincent ________________________________ From: Felix Maier <[email protected]> Sent: Wednesday 19 November 2025 13:24 To: [email protected] <[email protected]> Subject: Guacamole 1.6.0 – GUI accessible but login fails / auth provider not loading / strange password hash output You don't often get email from [email protected]. Learn why this is important<https://aka.ms/LearnAboutSenderIdentification> Hello everyone, I am currently setting up Apache Guacamole (version 1.6.0) and although I can now successfully access the Web GUI, I still cannot log in. I would appreciate your help solving this issue. Environment details: * Guacamole 1.6.0 * guacd 1.6.0 * Tomcat 9 * MariaDB (external Galera cluster) * MySQL authentication extension * Debian-based Linux ________________________________ Issue description The GUI loads correctly, and the JDBC driver issue has been resolved. However, whenever I try to log in (using guacadmin), authentication fails. When I check Tomcat’s status or logs, I consistently see the following warnings: WARN o.a.g.e.AuthenticationProviderFacade - Authentication attempt ignored because the relevant authentication provider could not be loaded. Please check for errors earlier in the logs. WARN o.a.g.event.EventLoggingListener - Authentication attempt from 192.168.0.1 for user "guacadmin" failed: unknown error (no specific failure recorded) There are no clear error messages indicating why the authentication provider is not being loaded. ________________________________ Strange SQL output When I inspect the user table using: SELECT * FROM guacamole_user; I still see strange or binary-like characters in the password_hash and password_salt fields. Example: | password_hash | =�Fp�xe�Զӷ�Ў���i8E�a�x | | password_salt | ��J[*m | I am not sure whether this is expected binary data, an encoding issue, or something related to Galera replication. ________________________________ What is working * Database connectivity (after switching to the MariaDB JDBC driver) * Web interface loads normally * Galera cluster is healthy * Schema import completed without visible errors ________________________________ My questions 1. Why is the authentication provider not being loaded correctly? 2. Are the binary-looking password hashes normal for Guacamole? 3. Could the Galera cluster setup cause issues with these fields? 4. Is there a recommended way to verify or recreate the default guacadmin user? I can provide more logs or configuration details if needed. Thanks a lot in advance for your help! Best regards, Felix IT Solutions Email Disclaimer - The information contained in this email message, including any files transmitted with it, is confidential and may be legally privileged. This e-mail is intended only for the personal attention of the stated addressee(s). Any access to this email, including any files transmitted with it, by any other person is unauthorised. If you are not an addressee, you must not disclose, copy, circulate or in any other way use or rely on the accuracy or completeness of the information contained in this email or any files transmitted with it. If you have received this email in error, please inform the sender immediately and delete it and all copies from your system. You may not forward this email without the permission of the authorised sender. The views expressed in this email are those of the author, and do not necessarily represent the views of IT Solutions or its affiliates. Internet communications are not secure and IT Solutions cannot therefore accept legal responsibility for the contents of this message nor for any damage caused by viruses. This email has been scanned at the originating end. For further information on IT Solutions visit https://www.itsolutions.ie
