smc router

i have a smc 2804WBRP-G wireless router. After enabling mac address
filtering i get the following message when i try to log into my router.

Duplicate Administrator This device is managed by 192.168.2.101
currently!!

Any ideas why?

birarai

When you changed the configuration the router failed to logoff the
previous administration session. Try power-cycling the router. If all
else fails you can reset to default configuration and reconfigure.

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Sylpheed-Claws on Gentoo/PPC