On Wed, Sep 2, 2020 at 9:01 AM erez <[email protected]> wrote: > Hello, > We have a running guacamole system that works well. Usually, there are no > problems, we can create connections from the website through the guacamole > webserver. > However, sometimes, like 10% of the connections, are closing unexpectedly, > after an exception is thrown, but there is no clue why this is happening. > > The error happens in the function doRead, when calling the function: > char[] message = reader.read(); > After this call, an exception is thrown, saying "Non-numeric character in > element length." > > Note, sometimes another exception is thrown (not sure from what call) that > says "Element terminator of instruction was not ';' nor ','" > > The exceptions cause closing the tunnel, therefore the next 'read' query > from the client is responded with 404 'No such tunnel'. > > Is this Guacamole Client or a custom application?
> Tried to search on the web but nothing seems to be the solution, as 90% of > the times the connection succeeded. > > Are you using a reverse proxy in front of Tomcat? If so, have you configured the required proxy settings as described in the manual? I'm thinking specifically of disabling buffering... Other than that, if there are any web application firewalls or deep packet inspection devices in between the clients and the server they could be disrupting the communications. -Nick
