Guacamole Interface Blank Page

[Kamal Ezzaki <ka...@gmail.com>]

*Hello after i restart my centos server i get a blank Page and when i check
out my log files i have ths error : *
*Mar  7 05:42:16 localhost server: 05:42:16.838 [http-bio-8080-exec-3]
ERROR o.a.g.rest.RESTExceptionMapper - Unexpected internal error:Mar  7
05:42:16 localhost server: ### Error querying database.  Cause:
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link
failureMar  7 05:42:16 localhost server: The last packet sent successfully
to the server was 0 milliseconds ago. The driver has not received any
packets from the server.Mar  7 05:42:16 localhost server: ### The error may
exist in org/apache/guacamole/auth/jdbc/user/UserMapper.xmlMar  7 05:42:16
localhost server: ### The error may involve
org.apache.guacamole.auth.jdbc.user.UserMapper.selectOneMar  7 05:42:16
localhost server: ### The error occurred while executing a queryMar  7
05:42:16 localhost server: ### Cause:
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link
failure*

Re: Guacamole Interface Blank Page

[Kamal Ezzaki <ka...@gmail.com>]

OKeeeey i found it and you were right Mike this is a probleem with SElinux
and after i execute this commande "*sudo setenforce 0" *it's work thank you
all

Re: Guacamole Interface Blank Page

[Kamal Ezzaki <ka...@gmail.com>]

i checked my guacamole.properties and the details are correct and also
Mysql is running . The problem is that everything was working fine until i
reboot my Centos Systeme

Re: Guacamole Interface Blank Page

[Nick Couchman <vn...@apache.org>]

On Thu, Mar 7, 2019 at 5:48 AM Mike Jumper <mj...@apache.org> wrote:

> On Thu, Mar 7, 2019, 02:43 Kamal Ezzaki <ka...@gmail.com> wrote:
>
>> *Hello after i restart my centos server i get a blank Page and when i
>> check out my log files i have ths error : *
>> *Mar  7 05:42:16 localhost server: 05:42:16.838 [http-bio-8080-exec-3]
>> ERROR o.a.g.rest.RESTExceptionMapper - Unexpected internal error:Mar  7
>> 05:42:16 localhost server: ### Error querying database.  Cause:
>> com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link
>> failure*
>>
>
> Double check that the network details for your database server in
> guacamole.properties are correct.
>
> Assuming they are, I recommend checking your SELinux audit logs. Tomcat
> may be being denied network access to MySQL.
>
>
Or, if this was right after you restarted your system, make sure that MySQL
is starting up and is set to start on boot.

-Nick

Re: Guacamole Interface Blank Page

[Mike Jumper <mj...@apache.org>]

On Thu, Mar 7, 2019, 02:43 Kamal Ezzaki <ka...@gmail.com> wrote:

> *Hello after i restart my centos server i get a blank Page and when i
> check out my log files i have ths error : *
> *Mar  7 05:42:16 localhost server: 05:42:16.838 [http-bio-8080-exec-3]
> ERROR o.a.g.rest.RESTExceptionMapper - Unexpected internal error:Mar  7
> 05:42:16 localhost server: ### Error querying database.  Cause:
> com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link
> failure*
>

Double check that the network details for your database server in
guacamole.properties are correct.

Assuming they are, I recommend checking your SELinux audit logs. Tomcat may
be being denied network access to MySQL.

- Mike