When a client computer is not configured to automatically adjust the link speed of its network adapter, some functions might take a long time to finish. Such functions include creating team projects, saving work items, or merging code changes. In some cases, these functions might never finish, and an error message might appear that contains the phrase "The underlying connection was closed."
The speed with which a function finishes depends, in part, on the speed of the computer network. The configuration of network switches and your computers' network adapters can affect the network throughput. For example, "autosense mode" or "auto-negotiation" might be turned on, and information might be transmitted in either full-duplex mode or half-duplex mode.
To minimize the time required for a function to finish, you should confirm that these settings are set appropriately for maximum throughput. For more information about how full-duplex mode differs from half-duplex mode, contact your network administrator.
To perform these procedures, you must be a member of the Administrators security group on your local computer.
To configure a computer to automatically adjust the link speed of its network adapter in Windows Server 2008
On the Start menu, click Control Panel.
Click Network and Internet.
Click Network and Sharing Center, and then click Manage network connections.
The Network Connections folder opens.
Right-click the relevant network connection (by default, Local Area Connection), and then click Properties.
The Local Area Connection Properties dialog box opens.
The properties dialog box for the adapter opens.
Click the Advanced tab.
In the Property list, click the property that corresponds to the connection type, such as Connection Type, Duplex Mode, Media, Media Type, or Link Speed & Duplex, depending on the adapter's attributes.
In the Value list, click Autosense.