Freezed download via Wanproxy

Ivan Pizhenko ivan.pizhenko at
Tue Mar 6 18:15:39 PST 2018

Hi Juli,

Thanks for replying to my email.

I am using Linux. I have set up VirtualBox VM with Xubuntu 16.04 LTS
with latest HWE kernel 4.13 and all latest updates. I have not tuned
any OS options related to networking and TCP/IP protocol. I am not
using libuinet. I am not targeting FreeBSD, I need to have it working
on Linux, primarily on Ubuntu Server.

So I also was expecting that connection should be reset after some
reasonable timeout, but that didn't happen (or I have waited for too
short time??? I remember it was like at least 10 minutes). So present
mechanism seems to don't work. Thanks, heartbeat is interesting idea,
but probably there is something we can do via TCP connection settings
that we did not do yet? I am not big specialist in TCP protocol
settings, but I suppose you must be more aware in this area, so I am
asking about this, probably you can recommend something else. If
nothing more can be done, then sure, I will need to implement


2018-03-06 3:48 GMT+02:00 Juli Mallett <juli at>:
> Hi Ivan,
> WANProxy should pass along state when a stream is closed from end to end,
> not perfectly, but your connection should be properly reset at some point
> from the server going away.  There isn't anything that can be done in a
> protocol-neutral way that exceeds that, but that should be good enough for
> most uses.  Of course there are things that can disrupt the TCP state
> machine, or settings on a system can mean that connections aren't timed out
> when they should be.
> Are you using libuinet, FreeBSD, Linux, or something else for the TCP/IP
> stack?
> An easy change would be to add a heartbeat on all active sessions with
> WANProxy to actively probe for disconnected peers, but I'm not sure I'd
> encourage that.  If you think that would be helpful to you, let me know.
> Thanks,
> Juli.
> On Sat, Feb 24, 2018 at 1:09 AM, Ivan Pizhenko <ivan.pizhenko at>
> wrote:
>> Hi,
>> I am making some tests with Wanproxy to understand how much it is
>> stable and reliable. I am using latest Wanproxy code from Github and
>> work on Ubuntu 16.04 LTS with kernel 4.13 and all latest updates.
>> I have conducted following simple test:
>> I have installed locally Apache 2 HTTP Server and put some large file
>> into the document root. Then I have configured, also locally, "client"
>> and "server" Wanproxy similar to how it is described in examples
>> section on, but without ssh tunnel between them, to proxy
>> Apaches's HTTP port. Then I have used wget to download that large file
>> through "client" Wanproxy. It worked fine but slower than direct
>> download from Apache. Then I have tried to do the same thing but  I
>> have shut down "server" Wanproxy somewhere in the middle of download.
>> The download has freezed, the were no further progress. When I have
>> restarted "server" Wanproxy, the download did not resume. When I shut
>> down client Wanproxy, wget showed error like "connection refused" and
>> exited.
>> I would expect that when "server" Wanproxy went down, "client" one
>> would disconnect clients connected to it to indicate that upstream
>> link is broken, if not immediately, then after some reasonable
>> timeout. Is there a way to achieve something like this with Wanproxy?
>> If not, what changes to Wanproxy are needed to enable such
>> functionality?
>> Ivan.
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