Sony VGN-FS415E User Manual page 133

What are channels?
Wireless LAN communication occurs on divided frequency bands known as channels. Third-party wireless LAN access
point channels may be preset to different channels from Sony devices.
If you are using a wireless LAN access point, see connectivity information contained in your access point instructions.
When I change the encryption key, the network connection stops. What should I do?
Two computers with built-in wireless LAN may loose a peer-to-peer network connection if the encryption key is changed. You
can either change the encryption key back to the original profile or re-enter the key on both computers so the key matches.
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Troubleshooting