Sony VGN-S4HP/B User Manual page 151

I cannot communicate with the other device although the distance between both devices is
within 10 metres
The data transfer distance can be shorter than 10 meters depending on existing obstacles between the two devices, on radio
wave quality, on the operating system or the software used. Try to move your computer or to place both devices closer.
If the device with which you want to communicate is already communicating with another Bluetooth device, it may not be found
or it may not be able to communicate with your computer.
Check that the Bluetooth functionality of the device with which you want to communicate is on. See the other device's manual
for more details.
File transmission and reception fail.
When transmitting a file with the Bluetooth File Forwarding Wizard, the receiving device must be set beforehand to receive
incoming transmissions.
To set a device to receive incoming transmissions
1 Start the computer and turn on the Bluetooth device.
2 Click Start, point to All programs, Accessories, and Communications, then click Bluetooth File Forwarding Wizard.
3 Click Next, select the check box next to Receive files, and click Next again.
The message The Bluetooth device requires authentication appears on the taskbar.
The target Bluetooth enabled device is requesting connection authentication. Mutual authentication is required to enable
Bluetooth communications with this device.
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Troubleshooting