When trying to browse a Web page that is hosted by Internet
Information Server/Services, clients may report they are unable to connect.
Unfortunately, there is no single cause for IIS failing to
serve Web pages. Even if network connectivity can be eliminated as the cause,
additional information is required to determine the exact reason why clients
cannot connect to the server.
Because IIS is a complex product that relies on various
operating system components, it is important to determine if only certain types
of content have stopped being served. Following are two samples that you can
use to test the two most common types of content:
- Static HTML (.htm or .html files)
- Active Server Pages (ASP) pages (.asp files)
To test IIS's ability to serve HTML (static) content.Create a file called
Hello.htm in
the content folder for IIS (by default, this is C:\Inetpub\Wwwroot) that
contains the sample code listed below.
Then request
http://localhost/hello.htm
(http://localhost/hello.htm)
from
the Web browser that is installed on the IIS server.
<HTML>
<TITLE>HTML Test Page</TITLE>
If you see "Hello World" below, then HTML pages are serving properly.
<STRONG>Hello World</STRONG>
</HTML>Create a file called
Hello.asp in
the content folder for IIS (by default, C:\Inetpub\Wwwroot), that contains the
following sample code,
Then request
http://localhost/hello.asp
(http://localhost/hello.asp)
from
the Web browser that is installed on the IIS server.
<%
strWrld="Hello World"
%>
<HTML>
<TITLE>ASP Test Page</TITLE>
If you see "Hello World" below, then ASP pages in this Web application are serving properly.
<STRONG><%=strWrld%></STRONG>
</HTML> The Hello.htm and Hello.asp samples can also be downloaded.
The following file is
available for download from the Microsoft Download Center:
Hello.exe
(http://download.microsoft.com/download/iis50/other/1.0/win98mexp/en-us/hello.exe)
Release Date:
May-17-2001
For additional information about how to download
Microsoft Support files, click the following article number to view the article
in the Microsoft Knowledge Base:
119591Â
(http://kbalertz.com/Feedback.aspx?kbNumber=119591/EN-US/
)
How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most
current virus-detection software that was available on the date that the file
was posted. The file is stored on security-enhanced servers that help to
prevent any unauthorized changes to the file.
The Hello.exe file contains the following files:
Collapse this tableExpand this table
| File Name | Size |
|---|
| Hello.htm | 631 bytes |
| Hello.asp | 789 bytes |
Hello.asp Displays Properly
If the phrase "Hello World" is displayed properly on the ASP test
page, but another ASP page does not serve properly, the following reasons may
apply:
- The failing ASP page is running in a separate process from
the Web application that is running the Hello.asp test page. Each process
(Inetinfo.exe, Mtx.exe, or Dllhost.exe) that is capable of serving ASP pages
(or any other Internet Server API application) has its own thread pool, which
is separate from the thread pool in other processes. If one process is
experiencing blocking (also known as ASP queuing, which occurs when all
available threads are in use but additional requests continue to come in), a
separate process may continue serving ASP pages properly because it has its own
thread pool from which to execute requests.
- The failing page is not executing static HTML or ASP
content. If the failing page is a Common Gateway Interface (CGI) application,
see the following Microsoft Knowledge Base article for additional information
on troubleshooting CGI applications:
If the failing page is executed by an ISAPI
application developed by a third-party company, contact that third party for
technical support.
Hello.asp Does Not Display Properly
- If the phrase "Hello World" is not displayed on the ASP
page, it is possible that the ASP threads are queued, blocked, or deadlocked,
which requires additional problem-solving that is beyond the scope of this
article.
- The failing ASP page contains a problem that is preventing
IIS from properly serving ASP content (see the thread pool/ASP queuing
information earlier in this article). If custom COM objects are in use on any
of the pages that are failing, you can try contacting the vendor of those COM
objects or the developer of that page for technical support. To determine if
COM objects are in use, search for occurrences of "Set" (Microsoft Visual Basic
Script) or "var" (Microsoft JScript). If either of those keywords exist, the
COM object called is in the parentheses following CreateObject (VBScript or
JScript) or ActiveXObject (JScript).
Hello.htm Does Not Display Properly
If Hello.htm does not display properly, one of the following
reasons may apply:
- IIS is not listening on the IP address and port requested
by the client.
- Networking issues are preventing the client from reaching
the server (consider testing with a Web browser on the IIS server).
For more information on troubleshooting Web applications, see
the following Microsoft Web pages:
Debugging Distributed Web Applications
http://msdn2.microsoft.com/en-us/library/ms951776.aspx
(http://msdn2.microsoft.com/en-us/library/ms951776.aspx)
Problem Isolation with Web-Based Applications
325162Â
(http://kbalertz.com/Feedback.aspx?kbNumber=325162/
)
Support WebCast: Problem Isolation with Web-Based Applications
To learn about recommended settings and optimization of IIS, see
the following Microsoft Web pages: