I also read what you wrote in the slush thread. That you have your miner ip saved as a bookmark. If your miner is still set to DHCP, that ip can change.
Log into your router and double check for the ip address of your miner.
my friend thanks for your response.
my miner is in dhcp setting.
i log my router but the router cannt see the miner.
just show me the pc ip address.
seems like miner disappears.
I have an idea. Go to the Awesome Miner thread -
https://bitcointalk.org/index.php?topic=676942.0 - and download the free version of Awesome Miner. Once you have it installed on your PC, click the "New Miner" button in the top left of the program, this will allow you to install a new miner. Click next and then choose the 2nd option, "External Miner - Network scan". Click "Next" again and then click "Start Scan" button. It should find your miner IP Address.
It will default to the 192.168.1.0 - 192.168.1.255 address range. If your IP address on your network is different, you must change the scanning address range as needed.
Let us know how it goes.
Good luck.
EDIT: Of course your miner needs to be running and connected to the network for this to work. Good luck.