[aida] Mysterious problem only Firefox, only hosted Server no clue how to solve

Herbert König herbertkoenig at gmx.net
Wed Nov 14 14:42:04 CET 2012

Hi Janko,

Am 13.11.2012 23:29, schrieb Janko Mivšek:

thanks a lot. Shall I use Wireshark on the server (text only) or on the 

Anyway, important things first, so I replaced the buttons with links 
which works and I wrote a Selenium test which tests this several times 
and ran it on three computers simultaneously for an hour. Not a single 

As tedious as it is to write a Selenium test for a dynamic webapp as big 
is the confidence you get out of them. BTW the Hetzner Vserver performs 
well, around 10% user CPU from top.

So the pressure is away and  tonight I'll check what you suggested. 
Because before I tried to put these buttons elsewhere and could not get 
rid of the problem.



> Hi Herbert,
> Dne 13. 11. 2012 22:14, piše Herbert König:
>> Hi,
>> this really bugs me since two days and I'm really out of my depths here.
>> In my app I have a WebButton whose action does a simple self
>> redirectToView: .... like I have in several cases.
>> This is the generated HTML, both buttons have the same problem.
>> <inputtype="submit"value="Dieses Profil drucken"name="plotThis">
>> <inputtype="submit"value="Alle Positionen drucken"name="plotAll">
>> <td>
>> This always works on a Windows Server and on an Ubuntu Server running in
>> a VM in my local network.
>> On the hosted Ubuntu server (same Ubunu) only on Firefox it regularly
>> fails (not always) while it always works on Chrome and Opera. The
>> tendency is: the slower the computer running the browser the better it
>> works.
> So it seems to be related to network latency somehow ...
>>   The problem is that the action method of the button never gets sent,
>> because SwazooBuffer>>refillFrom raises a SwazooStreamNoDataError "No
>> data available, socket probably closed".
> - try to look at last read SwazooBuffer to see if there really isn't
> enough data, if data is complete (any bye missing) etc.
> - with Wireshark capture packets on the wire to see if there are complete.
> - it could be that packets are very fragmented, but they shouls work
> that way too
> - download one large static file and compare its contents to the
> original. One upon the time Squeak Swazoo had some such problems and can
> be related to your problem.
>> I get the same problem with several versions of Swazoo incl. the latest
>> download from Aidaweb.si.
>> I've attached a Stack trace. Help is really appreciated.
>> Thanks,
>> Herbert
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>> Aida at aidaweb.si
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