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From Konstantin Preißer <>
Subject RE: Tomcat closes Websocket connection when using a SSL HTTP APR connector (was: RE: Tagging 7.0.46)
Date Wed, 16 Oct 2013 23:44:02 GMT
> -----Original Message-----
> From: Konstantin Preißer []
> Sent: Thursday, October 17, 2013 1:23 AM
> To: 'Tomcat Developers List'
> Subject: Tomcat closes Websocket connection when using a SSL HTTP APR
> connector (was: RE: Tagging 7.0.46)
> > -----Original Message-----
> > From: Konstantin Preißer []
> > Sent: Wednesday, October 16, 2013 3:33 PM
> > I also need to do more testing because the error is not very reproducible
> on
> > my current machine (but I have another one where it was more
> > reproducible) to make sure what error exactly happens and when.
> Hi,
> I am now on a machine (Intel Core i7-3770, Win8 x64) where I can reproduce
> the error very easily (after a few seconds of drawing at the drawboard).
> In summary: When running current Tomcat trunk on Windows 8 x64 with Java
> 1.7.0_45 x64 and TC-Native 1.1.29, and using a SSL HTTP APR connector, then
> Tomcat will close the Websocket connection after a few seconds of drawing
> to the Drawboard Websocket example. This does not happen with a non-SSL
> APR connector.
> What I did was:
> 1) Checkout trunk (r1532781). Then update the path
> "webapps/examples/WEB-INF/classes/websocket" to r1532286 because
> after this revision I made a change to the Room implementation which makes
> the error harder to reproduce.
> 2) Build the working copy, then copy the current v1.1.29 "tcnative-1.dll" into
> the bin directory.
> 3) Configure a SSL HTTP APR connector in server.xml:
>   <Connector
>        protocol="HTTP/1.1"
>        port="8443" maxThreads="200"
>        scheme="https" secure="true" SSLEnabled="true"
>        connectionTimeout="20000"
>        SSLCertificateFile="${catalina.base}\conf\ssl\mycert.crt"
>        SSLCertificateKeyFile="${catalina.base}\conf\ssl\mypem.pem"
>        SSLVerifyClient="optional" SSLProtocol="TLSv1"
>        />
> 4) Run Tomcat; then open Firefox and visit
> https://localhost:8443/examples/websocket/drawboard.xhtml
> 5) Draw continuously on the drawboard (e.g. by doing fast circular
> movements with the mouse) using the "Brush" setting.
> 6) After a several seconds, Firefox will display "Websocket connection
> closed" and you can't draw anymore. Tomcat doesn't log anything to the
> console.
> When using my TCP forwarder tool between Firefox and Tomcat, I can see
> that Tomcat aborts/resets the TCP connection (Winsock error: 10053 and
> 10054) when this happens.
> When you try this with a non-SSL HTTP APR connector, everything works
> fine: The Websocket connection will not be closed, regardless of how long
> you are drawing.

Additional information:
When I try this with r1532720, then when this close of the Websocket connection happens, Tomcat
logs following exception:

17-Oct-2013 01:38:28.378 SEVERE [http-apr-8443-exec-1] websocket.drawboard.DrawboardEndpoint.onError
onError: Unexpected error [20,014] reading data from the APR/native socket
[245,310,416]. Unexpected error [20,014] reading data from the APR/native socket [245,310,416].
	at org.apache.coyote.http11.upgrade.AprServletInputStream.doRead(
	at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(
	at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(
	at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(
	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(
	at java.util.concurrent.ThreadPoolExecutor.runWorker(
	at java.util.concurrent.ThreadPoolExecutor$

However, since r1532721, when the closing of Websocket/TCP connection happens, no exception
is logged.

Konstantin Preißer

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