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- Thread starter MLO
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It looks like your IP is being used by another device on the network. Are you setup for DHCP or are you trying to assign your own IP statically?
Firstly, you should have used the crosshairs when taking your screenshot and selected the error message box, and not your whole screen, it's pretty hard to see! The shortcut to do that is Command-Shift-4.
Ok... now, your best bet to fix this issue, is to assign a specific IP to your computer. You can do this by going into your System preferences > network.
As shown here. (click on the screenshot on the page for the next screenshot)
http://www.simplehelp.net/2007/11/07/screenshot-simulation-os-x-105-leopard-network-settings/
Assign an IP to your connection.
Ok... now, your best bet to fix this issue, is to assign a specific IP to your computer. You can do this by going into your System preferences > network.
As shown here. (click on the screenshot on the page for the next screenshot)
http://www.simplehelp.net/2007/11/07/screenshot-simulation-os-x-105-leopard-network-settings/
Assign an IP to your connection.
Not a good idea as you may cause the same issue for a different device on the network.
If the OP is using DHCP, then the best bet would be to find the person with the statically assigned IP and change that config.
OP, is this a network you control?
I have this same problem! I'm on a network I control, using DHCP to assign addresses. When I assign a static IP to a device I make darn well sure that it is outside the range of dynamic IPs the router uses... but these messages will not go away. 
If the router is accessible I would check which IP are assigned to which devices and then correct the problem (by either using DHCP everywhere or setting the IP outside the DHCP IP range). How you do it depends on which routers one have.
IF everything seems to be correct try restarting the router.
IF everything seems to be correct try restarting the router.
I have this same problem! I'm on a network I control, using DHCP to assign addresses. When I assign a static IP to a device I make darn well sure that it is outside the range of dynamic IPs the router uses... but these messages will not go away.
Try clearing your caches and PRAM.