Event ID 115 Occurs When You Attempt to Connect to a Web Site by Using HTTPS

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Article ID: 284984
We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 7.0 running on Microsoft Windows Server 2008. IIS 7.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:
http://www.microsoft.com/technet/security/prodtech/IIS.mspx
For more information about IIS 7.0, visit the following Microsoft Web site:
http://www.iis.net/default.aspx?tabid=1
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Symptoms

When you attempt to connect to a Web site by using HTTPS, the following error message occurs in Microsoft Internet Explorer:
This page cannot be displayed
The following information occurs in the Event Logs:
Event Type: Error
Event Source: W3SVC
Event ID: 115
Description: The service could not bind instance 1. The data is the error code. For additional information specific to this message please visit the Microsoft Online Support site located at: http://search.support.microsoft.com/search/?adv=1.
Data: 0000: 34 00 00 00 4...
NOTE: The "instance" in the error description refers to the Web site number. As Web sites are added to IIS, they are incrementally numbered. This error indicates that the Default Web Site (or site number 1) is having problems. Specifically, in this example "Event ID: 115" refers to the SSL portion of the Default Web Site not being able to start. "Event ID: 113" refers to the port 80 bindings (non-SSL) having difficulty starting.

Cause

This error can occur for several reasons, but basically, IIS is not able to bind to the port or IP address specified in your settings, because another program or service is already using them. For examples of this problem, and possible resolutions, see the "Workaround" section of this article.

Workaround

Example 1

Web site number 3 has the following settings:
IP address assigned as 192.168.0.1
TCP Port assigned as 80
SSL Port assigned as 443
Host Header of www.company.com
Web site number 10 has the following settings:
IP address assigned as 192.168.0.1
TCP Port assigned as 80
SSL Port assigned as 443
Host Header of www.different.com

To host multiple Web sites on IIS, each Web site must be unique by using different IP addresses, different port numbers, or different Host Headers. In this example, the settings seem to be correct, because the Host Header on each site is different. For the purpose of SSL, however, Host Headers cannot be used, which means that the SSL portion of the Web sites have the same settings. As the Web service initializes, it can start the first Web site completely. When it tries to start Web site 10, it can start the port 80 portion, but cannot start the port 443 portion, which causes the Event ID 115 error. To resolve this particular problem, assign one of these Web sites a different IP address, so that they are unique for both TCP and SSL.

Example 2

Web site number 3 has the following settings:
IP address assigned as "All Unassigned"
TCP Port assigned as 80
SSL Port assigned as 443
Host Header is blank since we cannot use it with SSL
Web site number 10 has the following settings:
IP address assigned as 192.168.0.1
TCP Port assigned as 80
SSL Port assigned as 443
Host Header is blank since we cannot use it with SSL
In this example, there are unique settings for both SSL and TCP, because Web site 1 is not bound to any particular IP address, and Web site 10 is bound to a particular IP address. If you are using SSL, when the SSL portion of Web site 1 initializes, it essentially binds to all IP addresses on port 443, which causes Event ID 115 on instance 10.

Example 3

If you have assigned each SSL Web site a unique IP address and you still receive an Event ID 115, there may be some Advanced settings on a web site which are preventing the SSL portions of your Web sites from being unique. To view these settings go into the Properties for each Web site and click Advanced on the Web Site tab. You will see a section called Multiple SSL Identities for this Web Site. If the Web site only has one IP address assigned to it ensure that there is also only one SSL identity.

Example 4

If all else fails, it is likely that another program or service is running on your computer that is already bound to port 443. If this is the case, all of your Web sites (instances) that use SSL are logged with an Event ID 115. To verify this, use the following steps:
  1. From a command prompt, type net stop iisadmin, and then press ENTER to stop the IISADMIN service.

    NOTE: You may need to stop other IIS services.
  2. Type netstat -an, and then press ENTER. (If the output is too long, you may need to pipe the output by using | more or > output.txt.)
  3. Look for "0.0.0.0:443" or any other IP address ending in ":443" under the Local Address column. 0.0.0.0 means something is bound to all IP addresses onport 443 and 192.0.0.1:443 (this is only an example) means something is bound to the IP address of 192.0.0.1 on port 443. If after the IISADMIN service is stopped, if you see "0.0.0.0:443," then something else is bound and listening on port 443 other than IIS. To allow your web sites to run properly stop the other program that is using port 443.

Properties

Article ID: 284984 - Last Review: June 19, 2014 - Revision: 7.0
Keywords: 
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