Re: Underscore in IIS 6 Host Header definition
From: Aaron (Aaron_at_discussions.microsoft.com)
Date: 11/19/04
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Date: Fri, 19 Nov 2004 08:23:06 -0800
MS DNS allows underscore but IIS Host Headers do not, I just wondered if
there was a good reason...nothing spitefull intended. If the standards in
this case are not clear, then I see no rational reason for the inconsistancy.
Thanks for response,
Aaron
"David Wang [Msft]" wrote:
> 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 '_'?
> > > > >
> > > > >
> > > >
> > > >
> > > >
> >
> >
> >
>
>
>
>
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