Hi All,

I've got guacamole 0.9.9 set up inside docker on Ubuntu Server 14.04 LTS, using 
MySQL and LDAP authentication. On the whole it seems to work very well indeed 
but I have one user who is helping me test it who is having problems and I am 
stumped so I am wondering if anyone on here can help me?

The symptoms are that he can log in just fine but when he tries to open a 
connection he receives a 'Connection Error' - 'An internal error has occurred 
within the Guacamole server and the connection has been terminated. If the 
problem persists.....blah blah blah'. Looking in the logs (with "docker log 
guacamole-container"), all I can see is that his connection is made and then 
terminated a few milliseconds later.

 09:10:41.485 [http-nio-8080-exec-10] INFO  
o.g.g.net.basic.TunnelRequestService - User "satoshi.koyama" connected to 
connection "1".

 09:10:41.490 [http-nio-8080-exec-7] INFO  o.g.g.net.basic.TunnelRequestService 
- User "satoshi.koyama" disconnected from connection "1". Duration: 5 

It doesn't matter which connection he tries he always gets the same error. 
Other users can open these connections just fine. He has reproduced this in 
Chrome 53.0.2785.116 m and IE11 and gets the same behaviour in both. I am using 
the same browser versions and they are working fine for me.  I suspected 
localisation issues because he is on a Japanese OS but I have since tested on a 
Japanese VM and it's working fine from there.

Is there other logging I can look at to diagnose what is happening on the 
server? Any ideas what might be going on?

Many thanks, Andy.

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