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From Erik Berndt <>
Subject Re: "Communications link failure" Exception being thrown.... Dear god help
Date Tue, 23 Oct 2018 19:19:25 GMT
Hey Zach,

>The last packet sent successfully to the server was 0 milliseconds ago. The driver has
not received any packets from the server.Oct 23, 2018 6:28:44 PM com.sun.jersey.spi.container.ContainerResponse
logExceptionSEVERE: Mapped exception to response: 500 (Internal Server Error)

Have you checked any of the AWS logs? Based on the text above, there may be
something relevant there as to why the db server is not responding. Are you
able to ping across from the Guacamole instance to the db server and

Erik Berndt

On Tue, Oct 23, 2018 at 3:09 PM Mike Jumper <> wrote:

> Are you sure the database is reachable over the network from the Guacamole
> server? Not blocked by an AWS security group, subnet is in routing tables,
> etc.?
> - Mike
> On Tue, Oct 23, 2018, 11:57 doyouhas <> wrote:
>> I have pasted the relevant contents of the catalina.out file to the link
>> below, as in the past some people have complained about code formatting.
>> When I began testing my application, I was actually running a mysql server
>> on an ec2 instance instead of running against an RDS instance. So my
>> database currently is residing in an Aurora serverless cluster. I haven't
>> experienced this exception before. That is the only major differences
>> between my earlier test configurations. I am really stuck here, I have no
>> idea where to begin troubleshooting this issue. Checked the syslog, no
>> relevant messages logged there. I get the classic "blank screen" situation
>> that I have posted about in the past. Any help on this would be greatly
>> appreciated.
>> --Zach
>> --
>> Sent from:


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