[erlang-questions] is inet:gethostbyname( IP ) correct?

Raimo Niskanen <>
Wed Oct 21 10:38:03 CEST 2009


On Tue, Oct 20, 2009 at 06:45:25PM +0200, info wrote:
> 
> On Tue, 20 Oct 2009 11:33:35 +0200 info wrote:
> > I uninstalled Comodo and ... the problem disappeared !!!!!!!!!!!!!!!!!!!!!
> > What else now ?
> > John
> 
> Then we know it is firewall related. And we could not
> reproduce it with Comodo. Some more tiny detail seems
> to be needed to trigger the bug. Which version of Comodo
> do you have?
> 
> I had the version 2.4.19.185 ..
> I had because I didn't keep the exe :-( and the version 3 is not compatible with windows 2003
> I am "naked" since yesterday !

We tried Comodo Firewall 3.12, and it seems to work just fine.
I.e on Windows 2003 R2 Enterprise Edition with SP2.

> 
> Reinstall and see if the problem appears again, but first
> uninstall Erlang. Installation order may matter to trigger
> the bug. Uninstall both Erlang and Comodo and try
> installing Comodo first then Erlang. If that fails
> uninstall Erlang then Comodo (latest first), and install Erlang
> first then Comodo (the other order). Watch out the next
> paragraph about installing Erlang.
> 
> On Tue, 20 Oct 2009 11:33:52 +0200 info wrote:
> > OK, I found several versions in WinSxS.
> > Which one is the good one ?
> > Shall I copy it in system32 ?
> 
> No, uninstall Erlang, and reinstall it. Make sure to
> select the approx."Install Microsoft Runtime" in the
> installer. The installer installs it into a for
> Erlang unique location so Erlang will run exactly
> the runtime library it needs. Do not move it!
> 
> 
> We are now hunting something fishy (for Robert R) with
> IIS server and firewall client. Can you (info) tell us
> what happens when you have the symptoms, if you in
> a freshly started Erlang node only look up a
> short name e.g "localhost", because we now have
> a situation where it kind of works until we do
> a lookup containing a dot which hangs and after
> that everything hangs. Can you confirm this peculiar
> behaviour?
> 
> / Raimo
> 
> 
> 
> On Mon, Oct 19, 2009 at 11:53:07PM +0200, info wrote:
> > And what about msvcr80.dll which is missing in my server ?
> > 
> > On Sat, Oct 17, 2009 at 12:46:50AM +0100, info wrote:
> >  > On Fri, Oct 16, 2009 at 04:29:20PM +0200, info wrote:
> >  > I guess Robby wrote:
> >  >   > On Thu, Oct 15, 2009 at 4:28 PM, Raimo Niskanen     <
> >  >   >     <raimo%    >
> >  >   >    > wrote:
> >  >   > 
> >  >   >    > On Thu, Oct 15, 2009 at 03:02:40PM +0200, info wrote:
> >  >   >    >     > Dear Raimo,
> >  >   >    >     > I can resume: I discovered that gethostbyname call inet_gethost.c
> >  >   >    >     > I don't understand inet_gethost.c :-(
> >  >   >    >     > Where "goes" this problem for finding the information ?
> >  >   >    >     > If we know where and what, we could perhaps find what is missing in my
> >  >   >    > windows 2003 ...
> >  >   >    >     > Hope to read you soon !
> >  >   >    >     > John
> >  >   >    >
> >  >   >    > Well, there is not much more to say. inet_gethost.c calls
> >  >   >    > struct hostent *gethostbyname(const char *name) in the
> >  >   >    > winsock2 library:
> >  >   >    >  http://msdn.microsoft.com/en-us/library/ms738524(VS.85).aspx    <http://msdn.microsoft.com/en-us/library/ms738524%28VS.85%29.aspx    >
> >  >   >    > It never returns.
> >  >   >    > It is deprecated but that does not mean broken.
> >  >   >    > I have a Windows 2003 server that it works on.
> >  >   >    > We have not found the reason it differs between
> >  >   >    > my server and your server.
> >  >   >    > And that is about it.
> >  >   >    >
> >  >   >    >
> >  >   >    >
> >  >   > I can consistently reproduce the hanging gethostbyname() in inet_gethost.exe
> >  >   > on Windows 2003 when I have the 'Microsoft Firewall Client for ISA Server
> >  >   > Version 4.0' installed. This is a specific add-on, nothing to do with
> >  >   > Microsoft Firewall in your Network Properties.
> >  >   > 
> >  > 
> >  > I guess info wrote:
> >  >   > but I don't use ISA server !!!
> >  >   > 
> >  > 
> >  > No other interesting firewall software?
> >  > Yes: I am using Comodo.
> > 
> > Can you try to uninstall Comodo and see if the problem disappears.
> > If so we know where to look for the problem.
> > (We have installed a 2003 server with Comodo and got no problems,
> >  other than the possibility to do configuration errors that
> >  would cause your symptoms)
> > 
> >  > 
> >  > I guess Robby wrote:
> >  >   > If I remove it, it works fine, if I add it it hangs. Apart from that the
> >  >   > W2003 build is as vanilla as it gets.
> >  >   > 
> >  >   > Nothing much to go on, but I would not be surprised if some system DLL is
> >  >   > getting in the way. This is very hard to diagnose.
> >  >   > 
> >  >   > One day I'll get around to compiling inet_gethost.exe in my setup, just to
> >  >   > rule out poor linkage due to the VC++ setup used to build the shipping
> >  >   > executables. If I compile up a trivial gethostbyname() example from MSDN, it
> >  >   > works OK in all circumstances.
> >  >   > 
> >  >   > There are a few strange dependencies in other shipped Windows files, for
> >  >   > example beam.dll seems to depend on a particular MSVCR80.DLL with the
> >  >   > version 8.0.50727.1433 . And if you have an older Windows machine, you get
> >  >   > the completely unhelpful popup box telling you that your program could not
> >  >   > be run. This has something to do with Windows Side-by-Side DLL deployment,
> >  >   > and I completely fail to grasp what that's all about.
> >  >   > 
> >  > 
> >  > I guess info wrote:
> >  >   > but I don't have msvcr80.dll !!!
> >  > 
> >  > I guess you do, actually, since Erlang/OTP's installer is supposed
> >  > to install that DLL, if it does not exist already.
> >  > 
> >  > I guess Robby wrote:
> >  >   > 
> >  >   > Robby
> >  > 
> >  > -- 
> >  > 
> >  > / Raimo Niskanen, Erlang/OTP, Ericsson AB
> > 
> > -- 
> > 
> > / Raimo Niskanen, Erlang/OTP, Ericsson AB
> 
> -- 
> 
> / Raimo Niskanen, Erlang/OTP, Ericsson AB

-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB


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