https://issues.apache.org/bugzilla/show_bug.cgi?id=56299

            Bug ID: 56299
           Summary: mod_proxy_ws_tunnel - AH02447: err/hup on backconn
           Product: Apache httpd-2
           Version: 2.5-HEAD
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy
          Assignee: [email protected]
          Reporter: [email protected]

We're currently using Apache 2.4.9 on Win64 which seems to solve the "infinite
loop on websocket connection loss"
(https://issues.apache.org/bugzilla/show_bug.cgi?id=56145) problem for us.
However, what we are seeing now is entries like

[Fri Mar 21 08:00:10.405224 2014] [proxy_wstunnel:notice] [pid 19932:tid 836]
[client 172.29.184.113:53972] AH02447: err/hup on backconn
[Fri Mar 21 08:00:42.229688 2014] [proxy_wstunnel:notice] [pid 19932:tid 788]
[client 172.29.184.113:53982] AH02447: err/hup on backconn
[Fri Mar 21 08:05:08.604172 2014] [proxy_wstunnel:notice] [pid 19932:tid 840]
[client 172.29.184.113:54199] AH02447: err/hup on backconn
[Fri Mar 21 08:05:16.780267 2014] [proxy_wstunnel:notice] [pid 19932:tid 772]
[client 172.29.184.113:54210] AH02447: err/hup on backconn
[Fri Mar 21 08:05:21.724793 2014] [proxy_wstunnel:notice] [pid 19932:tid 768]
[client 172.29.184.113:54216] AH02447: err/hup on backconn
[Fri Mar 21 08:18:26.592849 2014] [proxy_wstunnel:notice] [pid 19932:tid 788]
[client 172.29.184.113:54414] AH02447: err/hup on backconn
[Fri Mar 21 08:18:26.595779 2014] [proxy_wstunnel:notice] [pid 19932:tid 764]
[client 172.29.184.113:54413] AH02447: err/hup on backconn
[Fri Mar 21 08:26:53.173822 2014] [proxy_wstunnel:notice] [pid 19932:tid 764]
[client 172.29.184.113:54463] AH02447: err/hup on backconn
[Fri Mar 21 08:40:58.011922 2014] [proxy_wstunnel:notice] [pid 19932:tid 840]
[client 172.29.184.113:60997] AH02447: err/hup on backconn
[Fri Mar 21 08:40:58.011922 2014] [proxy_wstunnel:notice] [pid 19932:tid 772]
[client 172.29.184.113:60998] AH02447: err/hup on backconn

We can't find any indication so far that there would be a problem with the
websocket server (Play/Netty). So it looks like this might be an issue with
mod_proxy_ws_tunnel?

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