401 error code is traditionally a access denied for a web page. Are you sure this is your router denying access or some other problem.
To rule out your router, connect directly to your modem (as you probably did to send this question). If, as I suspect, you are able to connect direct but not through the router, the simple fix is to do a hard reset to the router. Find the little hole on the back or the bottom. With the device unplugged, insert a paperclip into the hole and gently depress the switch for at least 30 seconds. This will set your device to factory settings.
May I recommend Network Magic for you. Free to download and evaluate for 7 days, NM is a excellent network management tool. It will help with connection problems, device sharing and security.
Following the evaluaation period, Cisco will permit you to continue to use NM free, although some features will not function. You may find those features to be worth the couple bucks they ask for for a full license. That is up to you to decide.
Find it here:
http://www.purenetworks.com/nmlp/home-networking.php?gclid=CL_Z3om1754CFUlo5QodIDUIJA&src=google&kw=network+magic+download
If you require software for the router, you can get that at
www.linksys.com/support
BTW, Cisco owns both Linksys and Network Magic
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