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Please check the advanced settings of your adapter this can be seen in the properties of the Intel® Centrino® Ultimate-N 6300 from the device manager.
How to access and configure advanced Wi-Fi adapter settings
Look for the first setting that is “802.11n Channel Width for band 2.4GHz” change the setting to Auto instead of 20MHz only, restart the computer and verify the connection again.
Here is some information about channel bonding:
What is channel bonding?
Please let us know the outcome of the options provided.
Wireless Technical Support