This article was previously published under Q319133
If you use the Microsoft Internet Information Server Management Console, you may notice that the Simple Mail Transfer Protocol (SMTP) virtual server has not started. If you try to start the Internet Information Services (IIS) Manager, also called the Internet Services Manager (ISM), you receive the following error message after a delay:
The service did not respond to the start or control request in a timely fashion.
Additionally, in the ISM status column for the SMTP virtual server, you may receive the following status message:
The requested control is not valid for this service.
Note On a Microsoft Windows Server 2003-based computer that has IIS 6.0 installed, you may also receive the following error message:
The service has returned a service specific error code.
The registry entries that are used by the SMTP virtual server may be missing or corrupted.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To resolve this issue, replace the missing or corrupted registry entries. To do this, follow these steps.
Click Start, and then click Run.
In the Open box, type regedit, and then click OK.
In Registry Editor, locate the following subkey in the registry:
Name Type Data ---------------------------------------- ncacn_http REG_SZ rpcrt4.dll ncacn_ip_tcp REG_SZ rpcrt4.dll ncacn_nb_tcp REG_SZ rpcrt4.dll ncacn_np REG_SZ rpcrt4.dll ncadg_ip_udp REG_SZ rpcrt4.dll
If any of the values that are listed in the table are missing from your registry, you must add them. To add a value, follow these steps:
On the Edit menu, click New, and then click String Value.
Type the name, and then press ENTER two times.
In the Edit String dialog box, type rpcrt4.dll, and then click OK.
Repeat steps a through c for each missing value.
On the Registry menu, click Exit to quit Registry Editor.
Restart your computer.
We strongly recommend that all users upgrade to IIS 6.0 installed on a Windows Server 2003-based computer. IIS 6.0 significantly helps increase Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site: