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When you establish a dial-up connection on a Windows Vista-based computer by using USB modem device, you cannot establish a new connection when after you resume the computer from standby

Article ID: 956502 - View products that this article applies to.

SYMPTOMS

You establish a dial-up connection on a Windows Vista-based computer by using USB modem device. Then, you put the computer into standby (the S3 power state). After you resume the computer from standby, you cannot establish a new connection, and you may receive the following error message:

Failed to connect to ConnectionName

Additionally, after you receive the error message, the following error may be logged in the Application log:

Log Name: Application
Source: RasClient
Event ID: 20227
Level: Error
Description:
CoID={XXXXXXXX-XXXX-XXXX-XXXXXXXXXXXXXXXXX}: The user UserName dialed a connection named ConnectionName which has failed. The error code returned on failure is 633.

CAUSE

In Windows Vista, when you put the computer into standby while it is using a dial-up connection, the computer goes into standby before the dial-up connection can be completely disconnected. Therefore, the disconnection process is complete only after the computer resumes from standby.

However, while the computer is resuming from standby, the status of modem device inside the Telephony service may become invalid, depending on the timing of the Plug and Play process within the modem device. Therefore, successive dial-up connections may fail.

Note Some USB modem devices shut down to reduce power consumption while the computer is in standby. When the computer resumes from standby, these modems turn on again. Therefore, the Plug and Play process is performed upon the modem device while the computer resumes from standby.