Therefore, when multicast clients roll over to a unicast connection, more stress is added to the network and to the server. If many clients roll over to a unicast connection, the user experience may be decreased if insufficient resources are available to carry the increased load. Similarly, a client that tries to connect to a unicast UDP stream rolls over to a TCP-based protocol if the client cannot connect to the stream. The message in the dialog box states that the application has been blocked from accepting connections from the Internet.
Therefore, if many clients roll over from UDP protocol to a TCP-based protocol, the server may experience increased load issues.
The protocol that is used for streaming may depend on the URL and the settings on both the server and the client. The client also caches information about the protocol that was used the last time that the connection was made successfully.
For later connections to a stream, the client may use this information to change the protocol that it tries first. To determine the protocol that is being used for a stream, a user can click Statistics on the View menu and then note the protocol that is specified on the Advanced tab.
In the following examples, the user is using Windows Media Player and the following are true:. Windows Media Player 10 - Multicast rollover occurs. The client performs a unicast protocol rollover and then connects to the stream by using TCP. When the user receives the Windows Security Alert notification, the user may choose not to see the notification again for the current application.
The error message suggests that a firewall might be the cause of this problem. Then, the user receives an error message from Windows Media Player. This error message states that the server is busy.
Many protocols try to negotiate automatically with the server for the most efficient way to exchange information. Some application settings may affect protocol rollover behavior.
See the product documentation for protocol rollover behavior. The client connects by using TCP. Windows Media Player 10 - The user receives an error message that Windows Media Player could not connect to the server. Then, the user receives an error message that Windows Media Player could not connect to the server.
For more information, see the product documentation. For more information about specific configuration settings, visit the following Microsoft Web site:. Need more help? Expand your skills. Get new features first. Was this information helpful? Yes No.
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