| Author |
Message |
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| Guest |
 Posted: Mon Nov 02, 2009 5:48 pm |
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Guest
|
Thanks a lot for the feedback! Then this fix will be in the
next release.
On Wed, Oct 28, 2009 at 11:35:34AM +0000, Robert Raschke wrote:
> Hi Raimo.
>
> On Fri, Oct 23, 2009 at 1:56 PM, Raimo Niskanen <
> raimo+erlang-questions@erix.ericsson.se<raimo%2Berlang-questions@erix.ericsson.se>
> > wrote:
>
> > After a week of bug hunting we can confirm this is really
> > Microsoft's bug, but we have a workaround.
> > (It may be Microsoft's and Comodo's bug, who knows...)
> >
> > It turns out if you mix overlapped I/O with non-overlapped
> > (asyncronous with syncronous) on different pipes, in this
> > case the pipe to inet_gethost.exe from erlang was opened
> > by erlang as non-overlapped and inet_gethost.exe itself
> > used overlapped on all its other sockets and pipes...
> >
> > ...alright if you mix ... I/O something gets not initialized
> > in Microsoft's libs unless you do a gethostname() call
> > before going into recv() of commands from erlang (we already
> > found this out the hard way) but now also if you had certain
> > firewalls installed it was not enough, you had to do
> > gethostbyname() calls with longer domain names to
> > work around Microsoft's bug.
> >
> > Since this felt like a way to shaky workaround we found
> > another that seems much better: now erlang can open the
> > pipe to this specific port program (inet_gethost.exe)
> > for overlapped I/O so inet_gethost.exe now uses overlapped
> > I/O only. This seems to avoid the bug.
> >
> > We reproduced the name lookup freeze with Comodo 2.4.19.185
> > and Microsoft's Client for ISA Server 4.0. Here is
> > a snapshot build (without documentation) that
> > does not freeze for neither of these firewalls.
> >
> > http://www.erlang.org/download/snapshots/otp_win32_R13B03_gethost_fix.exe
> >
> > Try it and see if it solves your problem.
> >
> > / Raimo Niskanen
> >
> >
> >
> Congratulations! You have a winner.
>
> I have gone through the following tests:
>
> R13B02-1 on W2003, no Firewall Client for ISA
> inet:gethostbyname("localhost").
> OK
> inet:gethostbyname("local machine name").
> OK
> inet:gethostbyname("machinename.localdomain").
> OK
> inet:gethostbyname("www.google.com").
> OK
> inet:gethostbyname("www.cisco.com").
> OK
>
> R13B02-1 on W2003, with Firewall Client for ISA
> inet:gethostbyname("localhost").
> OK
> inet:gethostbyname("local machine name").
> OK
> inet:gethostbyname("machinename.localdomain").
> OK
> inet:gethostbyname("www.google.com").
> timeout
> inet:gethostbyname("www.cisco.com").
> timeout
>
>
> R13B03_gethost_fix on W2003, no Firewall Client for ISA
> inet:gethostbyname("localhost").
> OK
> inet:gethostbyname("local machine name").
> OK
> inet:gethostbyname("machinename.localdomain").
> OK
> inet:gethostbyname("www.google.com").
> OK
> inet:gethostbyname("www.cisco.com").
> OK
>
> R13B03_gethost_fix on W2003, with Firewall Client for ISA
> inet:gethostbyname("localhost").
> OK
> inet:gethostbyname("local machine name").
> OK
> inet:gethostbyname("machinename.localdomain").
> OK
> inet:gethostbyname("www.google.com").
> OK
> inet:gethostbyname("www.cisco.com").
> OK
>
>
> Brilliant work for tracking down this obscure behaviour.
>
> Robby
--
/ Raimo Niskanen, Erlang/OTP, Ericsson AB
________________________________________________________________
erlang-questions mailing list. See http://www.erlang.org/faq.html
erlang-questions (at) erlang.org
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| Guest |
| Posted: Mon Nov 02, 2009 11:00 pm |
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Guest
|
Hi both,
Nothing to add ... It was not easy to find and resolve this problem !
I changed the firewall version and now everything is ok.
Thank you to Raimo.
John
Hi Raimo.
On Fri, Oct 23, 2009 at 1:56 PM, Raimo Niskanen <
raimo+erlang-questions@erix.ericsson.se <raimo%2Berlang-questions@erix.ericsson.se >
> wrote:
> After a week of bug hunting we can confirm this is really
> Microsoft's bug, but we have a workaround.
> (It may be Microsoft's and Comodo's bug, who knows...)
>
> It turns out if you mix overlapped I/O with non-overlapped
> (asyncronous with syncronous) on different pipes, in this
> case the pipe to inet_gethost.exe from erlang was opened
> by erlang as non-overlapped and inet_gethost.exe itself
> used overlapped on all its other sockets and pipes...
>
> ...alright if you mix ... I/O something gets not initialized
> in Microsoft's libs unless you do a gethostname() call
> before going into recv() of commands from erlang (we already
> found this out the hard way) but now also if you had certain
> firewalls installed it was not enough, you had to do
> gethostbyname() calls with longer domain names to
> work around Microsoft's bug.
>
> Since this felt like a way to shaky workaround we found
> another that seems much better: now erlang can open the
> pipe to this specific port program (inet_gethost.exe)
> for overlapped I/O so inet_gethost.exe now uses overlapped
> I/O only. This seems to avoid the bug.
>
> We reproduced the name lookup freeze with Comodo 2.4.19.185
> and Microsoft's Client for ISA Server 4.0. Here is
> a snapshot build (without documentation) that
> does not freeze for neither of these firewalls.
>
> http://www.erlang.org/download/snapshots/otp_win32_R13B03_gethost_fix.exe
>
> Try it and see if it solves your problem.
>
> / Raimo Niskanen
>
>
>
Congratulations! You have a winner.
I have gone through the following tests:
R13B02-1 on W2003, no Firewall Client for ISA
inet:gethostbyname("localhost").
OK
inet:gethostbyname("local machine name").
OK
inet:gethostbyname("machinename.localdomain").
OK
inet:gethostbyname("www.google.com").
OK
inet:gethostbyname("www.cisco.com").
OK
R13B02-1 on W2003, with Firewall Client for ISA
inet:gethostbyname("localhost").
OK
inet:gethostbyname("local machine name").
OK
inet:gethostbyname("machinename.localdomain").
OK
inet:gethostbyname("www.google.com").
timeout
inet:gethostbyname("www.cisco.com").
timeout
R13B03_gethost_fix on W2003, no Firewall Client for ISA
inet:gethostbyname("localhost").
OK
inet:gethostbyname("local machine name").
OK
inet:gethostbyname("machinename.localdomain").
OK
inet:gethostbyname("www.google.com").
OK
inet:gethostbyname("www.cisco.com").
OK
R13B03_gethost_fix on W2003, with Firewall Client for ISA
inet:gethostbyname("localhost").
OK
inet:gethostbyname("local machine name").
OK
inet:gethostbyname("machinename.localdomain").
OK
inet:gethostbyname("www.google.com").
OK
inet:gethostbyname("www.cisco.com").
OK
Brilliant work for tracking down this obscure behaviour.
Robby
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| Posted: Mon Aug 13, 2012 7:06 am |
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