Re: localhost is all that will work
From: Kristofer Gafvert (kgafvert_at_NEWSilopia.com)
Date: 12/29/04
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Date: Wed, 29 Dec 2004 09:37:41 -0800
Hello,
This is what is happening.
- The client looks up the IP of the domain name (Works, since the
webserver answers)
- The client opens a connection to the webserver (works, since the
webserver answers)
- The client writes an HTTP data stream to the webserver (works, this
is the request)
- The webserver answers the request, that the request was malformed.
If this happens for all your clients on the Internet, then it is likely
that the problem is somewhere on the network and/or webserver. These
clients do not have any proxy in common (which can be the case if they
all are located on the same subnet), and they are not using the same
client (they are not in a controlled environment).
So, we can rule out that the problem is the client.
We can also rule out that the problem is on the webserver, unless it
behaves differently depending on what IP was requested (if multihomed).
> Thanks for the reply. To clarify some points... localhost and
> 127.0.0.1 work on the local system where IIS is installed but the IP
> of the system as well as the name of the system will not bring up the
> website.
I assume that the name is the domain name, right? When you do this, how
is the connection made? Does it go thru the firewall? Your webserver
must find the external IP, and it is not part of your local network, so
the connection need to made in another way. If this succeeds, depends
on the router. (so in some occasions, you will never be able to connect
to the external IP from the webserver itself, because it cannot find
the machine).
So for simplicity, please do all testing accessing the external IP from
outside your local network.
> By external I meant people on the Internet. They cannot use the
> NATed IP address or the one assigned via my Internet provider.
> However, I think this is more an issue of the fact that I cannot even
> get it to work internally on my own network.
When you say that that it does not work for users on the Internet, what
does it mean that it does not work? Is it still the 400 Bad Request
message? Or is it simply that they cannot find the server?
If the clients get a "400 Bad Request", they can find the webserver
(since the message is generated by the webserver).
I'm trying to figure out if we see multiple problems, or "only" have
one issue.
> We do have a Cisco PIX firewall that my Internet provider maintains
> who assures me everything is setup correctly -- that it's a
> misconfiguration that I've done with IIS or something else (i.e.,
> DNS). Yet they have provided me with no help either. DNS appears to
> have the information correctly.
If we are talking about the "400 Bad Request" problem all the time,
then it cannot be DNS. It can still be the webserver, but i doubt.
> Can you give me some more information on this cross over cable
> solution?
I thought that your "external clients" was on the same Intranet. If
they are on Internet, accessing the website from different parts of the
world, then we do not need to do this.
> I also do not know what you mean by third party ISAPI filters. I've
> installed IIS 6.0 from Windows installation. I see ASP.net if that
> might be what you are referring to.
In IIS Manager, right click the website and click Properties. Click on
the ISAPI Filters tab. Do you find any filters listed?
Is this website accessible for us via the Internet? Can you give us the
URL (or send me an email if you do not want to post it here). I know
that i do not have anything that can modify the HTTP header, so i would
like to test it from here, if possible.
To sum up,
It works on the local webserver, if you access it via localhost or
127.0.0.1 (localhost will translate to 127.0.0.1 so that is no
surprise). It does however not work when you access the website using
its external IP. I *think* (i cannot know) that when you access it
using the external IP, the request will pass thru something (a proxy,
or something else), so that the request is made the same as the
external clients. This would explain that you cannot access the website
from the webserver when using the external IP.
All external clients gives a "400 Bad Request" message.
To me (right now), it sounds like something in between the webserver
and the clients modifies the HTTP header, causing this problem.
Can you check the settings on the webserver if it uses any proxy?
-- Regards, Kristofer Gafvert www.ilopia.com Pam Will wrote: > Thanks for the reply. To clarify some points... localhost and > 127.0.0.1 work on the local system where IIS is installed but the IP > of the system as well as the name of the system will not bring up the > website. > > By external I meant people on the Internet. They cannot use the > NATed IP address or the one assigned via my Internet provider. > However, I think this is more an issue of the fact that I cannot even > get it to work internally on my own network. > > We do have a Cisco PIX firewall that my Internet provider maintains > who assures me everything is setup correctly -- that it's a > misconfiguration that I've done with IIS or something else (i.e., > DNS). Yet they have provided me with no help either. DNS appears to > have the information correctly. > > Can you give me some more information on this cross over cable > solution? > > When I turn off the show friendly HTTP errors, I actually get nothing > back? Does that sound right? > > I also do not know what you mean by third party ISAPI filters. I've > installed IIS 6.0 from Windows installation. I see ASP.net if that > might be what you are referring to. > > Again, thank you for your help thus far. I hope my answers help you > on finding a solution for this issue. Thanks! > > "Kristofer Gafvert" wrote: > > > Hello Pam, > > > > 400 Bad Request usually means that the client is sending a bad > > request, and IIS informs the client that it will not process the > > request, because it is malformed. So it is not really an IIS issue, > > but more of a client sending requests that is wrong. > > > > You say that it is working on the local machine. You also say that > > it works only when using localhost. This makes me believe that when > > you use anything else on the local machine (the IP or domain name), > > the request first goes to another machine, for example a proxy. > > > > You also say that this happens for all(!?) external clients. Does > > all these clients have something in common? Do they pass any > > machine/router/firewall/proxy before they get to the webserver? > > > > There seems to be something in between the external clients and the > > webserver that is causing the Bad Request. You can verify this if > > you attach a machine directly to the webserver (via a crossover > > cable) and try to access the website. If it works, then something > > on the network is causing troubles. > > > > Can you please also turn off "Show Friendly HTTP Errors" in a > > webbrowser that fails, and then browse the website. Do you get any > > more information about the problem? > > > > I would also like to know if you have installed any third-party > > ISAPI filters. What happens if you disable these third-party ISAPI > > filters? > > > > I hope we can get a solution for this! > > > > -- > > Regards, > > Kristofer Gafvert > > www.ilopia.com > > > > Pam Will wrote: > > > > > I have a win 2003 server with IIS 6.0 installed. I'm trying to > > > get to my website from other workstations in the network or from > > > the outside but the only address that will work is to be on that > > > server and type localhost... > > > > > > Other workstations on the domain cannot access using the computer > > > name, the IP, and I cannot access with what should be it's > > > external name. > > > > > > I receive a HTTP 400 Bad Request message. > > > > > > I have a Cisco firewall in place. Not sure if I'm missing > > > something there. > > > > > > My ultimate goal is to use this as a Citrix system using NFuse > > > but I figured I'd better make sure I can crawl before I can run. > > > > > > Any help, articles, etc. would be greatly appreciated. Thank you. > >
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