Marcelo created GUACAMOLE-1983:
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             Summary: Communications link failure
                 Key: GUACAMOLE-1983
                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-1983
             Project: Guacamole
          Issue Type: Bug
          Components: guacamole-auth-jdbc-mysql
    Affects Versions: 1.5.5
            Reporter: Marcelo


I have guacamode deployed with docker swarm

guacamole version: 
[docker.io/guacamole/guacamole:latest|https://portainer.softpack.priv/#!/2/docker/images/docker.io~2Fguacamole~2Fguacamole%3Alatest]
guacamoledb version: 
[docker.io/mariadb:10.9.5|https://portainer.softpack.priv/#!/2/docker/images/docker.io~2Fmariadb%3A10.9.5]

guacad version: 
[guacamole/guacd:latest|https://portainer.softpack.priv/#!/2/docker/images/guacamole~2Fguacd%3Alatest]

I created those containers with previous versions, but now updated everything 
as shown previously, and now, on guacamole log i have:
{noformat}
The last packet sent successfully to the server was 0 milliseconds ago. The 
driver has not received any packets from the server.
14:56:35.881 [http-nio-8080-exec-2] WARN  o.a.g.e.AuthenticationProviderFacade 
- The "mysql" authentication provider has encountered an internal error which 
will halt the authentication process. If this is unexpected or you are the 
developer of this authentication provider, you may wish to enable debug-level 
logging. If this is expected and you wish to ignore such failures in the 
future, please set "skip-if-unavailable: mysql" within your 
guacamole.properties.
14:56:35.884 [http-nio-8080-exec-2] ERROR o.a.g.rest.RESTExceptionMapper - 
Unexpected internal error: 
### Error querying database.  Cause: 
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link 
failure

The last packet sent successfully to the server was 0 milliseconds ago. The 
driver has not received any packets from the server.
### The error may exist in org/apache/guacamole/auth/jdbc/user/UserMapper.xml
### The error may involve 
org.apache.guacamole.auth.jdbc.user.UserMapper.selectOne
### The error occurred while executing a query
### Cause: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications 
link failure{noformat}



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