Try reproducing Firefox Bug No. 611511

[Shlomi Fish]

Hi Yedidyah,

On Wednesday 01 December 2010 10:08:16 Yedidyah Bar-David wrote:
> Hi all,
> 
> I am a sysadmin in ISOC-IL for some years, so far did not identify myself
> as such...
> 

OK, good to know.

> On Wed, Dec 01, 2010 at 09:09:20AM +0200, Shlomi Fish wrote:
> > Hi all,
> > 
> > Please try to reproduce this Firefox bug (that also happens in Opera and
> > Konqueror):
> > 
> > https://bugzilla.mozilla.org/show_bug.cgi?id=611511
> > 
> > [quote]
> > When I access the URL (
> > ftp://mirror.isoc.org.il/pub/mandriva/devel/cooker/i586/media/main/releas
> > e/ ), firefox becomes unresponsive for many seconds, and the menus,
> > buttons, tabs, etc. won't respond. This also happens with other pages
> > and also HTTP pages.
> > 
> > I tried it in safe mode and was able to reproduce it there. I'm on
> > Mandriva Linux Cooker on a Pentium 4 2.4 machine. I recall this started
> > only a few days ago. I'm using the firefox-latest-nightly.
> > 
> > Reproducible: Always
> > 
> > Steps to Reproduce:
> > 1. Type firefox -no-remote -safe-mode.
> > 2. Go to the URL.
> > Actual Results:
> > Firefox become unresponsive.
> > 
> > Expected Results:
> > Firefox should load the page while still allowing to interact with it.
> > [/quote]
> > 
> > I'm on bezeqint.net.il.
> > 
> > Please comment on the bug report or here.
> 
> Well, a few notes:
> 
> 1. It also happened now to me, using google-chrome 7.0.517.44-r64615.
> It does not happen with lftp.

OK.

> 
> 2. I looked at the server logs, and it seems to me to happen to all the
> clients that use EPSV (Extended Passive mode, see rfc 2428 if interested).
> At least most if not all of them seem to give up after up to around half
> a minute and revert to "normal" Passive mode, which works.

Ah.

> 
> 3. It seems to be due to our filtering, which currently does not support
> EPSV mode. I have no idea if iptables supports EPSV and how well - if
> this is a serious issue, I can try looking at this. You are welcome to
> "vote" by emailing our official address mirrormaster at isoc.org.il which
> currently reaches Lior Kaplan and me.

OK, will do.

> 
> 4. The fact that a client, especially a sophisticated graphical one, gets
> stuck for an extended time, is obviously a bug, so you are welcome to
> continue with this venture of opening bugs and make them all behave more
> nicely.

Thanks.

> 
> 5. Since I do not know how, if at all, you can make firefox, and most
> other clients, use normal Passive mode and not Extended, the simplest
> workaround seems to me, for now, to be to use http. Any specific reason
> for using ftp in this case?

Well, for a time, I had horrible download speeds when downloading using 
http:// from http://mirror.isoc.org.il/ and it was better at using ftp:// so 
that's what I used.

> 
> 6. I have no idea what caused it to start happening a few days ago. We
> did not change anything on our side, as far as I know. Perhaps firefox
> changed its behaviour on a version you recently updated to. I definitely
> see in the logs such behaviour many months ago.

Well, I said "a few days ago" back at the bug report, which was reported at 
11-Nov-2010 (about three weeks ago).

Regards,

	Shlomi Fish

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