Re: Underscore in IIS 6 Host Header definition

From: David Wang [Msft] (someone_at_online.microsoft.com)
Date: 11/19/04 

Date: Fri, 19 Nov 2004 00:25:59 -0800

Hehe... what do you expect when RFCs, designed by public and unbiased
entities, do not agree nor fully flesh out details... are MS products
supposed to follow RFC and not work with each other, or not follow RFC and
work with each other but get blamed for not following standards. Or some
confused muddle in between, which makes everyone mad.

Hmm, it is no-win either way -- I think people just want to irrationally
blame Microsoft... 

-- 
//David
IIS
This posting is provided "AS IS" with no warranties, and confers no rights.
//
"Aaron" <Aaron@discussions.microsoft.com> wrote in message
news:B1AB464A-22A4-440E-B868-76DFCF55232B@microsoft.com...
Thanks for the ideas Seth. I'm not satisfied with the answer though. We've
had underscore in local host names for quite some time, before we switched
to
AD and MS DNS. Its interesting to note the RFC's don't seem to agree, and
neither do MS' products. We won't use underscore going forward however,
dashes will work just fine also.
Aaron
"srock" wrote:
> An underscore is not valid in host names. Microsoft removed support in IIS
6
> for the underscore in host headers because it's not valid. You can edit
the
> server binding manually to get it to 'work' if you really want to do
> something non-standard. If I were you, I'd spend the time to rename the
> site(s) in question.
>
> just do a google search and you'll find 100's of posts saying that an
> underscore n a host name is not valid.
>
> Seth
>
>
>
>
> "Aaron" <Aaron@discussions.microsoft.com> wrote in message
> news:955DAF21-9210-4EA8-85A9-AC110FB4EDFE@microsoft.com...
> > Thanks for checking that Seth. In RFC1033, the DNS Admin Guide it states
> > otherwise...any 8 bit character but specifically mentions underscore.
> Since
> > the RFC's are guidlines, who is right? I'm of the thinking that since MS
> DNS
> > lets you use underscore in host name records, why wouldn't their own web
> > server allow them?
> >
> > Excerpt from RFC1033:
> >
> > NAMES
> >
> >    A domain name is a sequence of labels separated by dots.
> >
> >    Domain names in the zone files can be one of two types, either
> >    absolute or relative.  An absolute name is the fully qualified domain
> >    name and is terminated with a period.  A relative name does not
> >    terminate with a period, and the current default domain is appended
> >    to it.  The default domain is usually the name of the domain that was
> >    specified in the boot file that loads each zone.
> >
> >    The domain system allows a label to contain any 8-bit character.
> >    Although the domain system has no restrictions, other protocols such
> >    as SMTP do have name restrictions.  Because of other protocol
> >    restrictions, only the following characters are recommended for use
> >    in a host name (besides the dot separator):
> >
> >            "A-Z", "a-z", "0-9", dash and underscore
> >
>
> --------------------------------------------------------------------------
> > "srock" wrote:
> >
> > > An underscore is not valid in host names. See section 2.3.1 of RFC
1035:
> > > http://www.faqs.org/rfcs/rfc1035.html
> > >
> > > Seth
> > >
> > > "Aaron" <Aaron@discussions.microsoft.com> wrote in message
> > > news:54FB41BF-65FE-4D5D-B553-5A232B669F79@microsoft.com...
> > > > Underscore (_) is perfectly valid in DNS, so why is it disallowed in
> the
> > > IIS
> > > > Host Header definition? It seems that the validation in IIS 6 only
> allows
> > > > A-Z, a-z, '.', and '-'. Why not '_'?
> > > >
> > > >
> > >
> > >
> > >
>
>
>

Relevant Pages

  • Re: Underscore in IIS 6 Host Header definition
    ... The RFC that you referenced does not define the standard for the DNS ... An underscore is not valid in a host. ...
    (microsoft.public.inetserver.iis)
  • Re: Underscore in IIS 6 Host Header definition
    ... An underscore is not valid in host names. ... Microsoft removed support in IIS 6 ... > Thanks for checking that Seth. ...
    (microsoft.public.inetserver.iis)
  • Re: Underscore in IIS 6 Host Header definition
    ... Thanks for the ideas Seth. ... We won't use underscore going forward however, ... > for the underscore in host headers because it's not valid. ... >> terminate with a period, and the current default domain is appended ...
    (microsoft.public.inetserver.iis)
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