If that doesn't work, click on the computer's start menu, than click on run. The run window opens. Type in cmd and hit enter. A dos window opens. Type in ipconfig after the C:\ string and hit enter.
IP address should be a number like 172.27.35.xxx. Example .xxx = .133
Subnet Mask is 255.255.255.0
Default Gateway is 172.27.35.1
If you don't see these kinds of numbers, click on your Network Places Icon and select properties.
Than right click on the Local Area Connection and select Properties.
Under the General tab, scroll down to Internet Protocol (TCP/IP) and highlight. (For windows 7 click on IPv4) Don't uncheck the box in front.
Click on Properties below.
Select Obtain an IP address automatically, and Obtain DNS address automatically.
Click Ok at the bottom of this window, and than click Ok in next window.
Restart the computer and type in http://172.27.35.1. The Ooma Setup page opens.
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This is a just "oh by the way":
If you are unable to access Ooma Setup with the router connected to the Ooma device's Home port, using a computer connected to one of the router's LAN ports, something is wrong.
Either the router is blocking port 80 or another application is using port 80 (sometimes spyware etc.), or the router is malfunctioning.
One way to tell if port 80 is being blocked is to access an Internet site like Google using a computer that is connected to one of the router's LAN ports. If you type in the Google address and hit enter, and the connection seems slow, and takes a while before Google comes up, the browser is directing the information to port 80, but after a short period of time when port 80 doesn't open, it redirects to another port.
Below are a few reasons and fixes:
The router's security level may be set to high. Answer: Lower the router's security level to mid level security and test with http:172.27.35.1.
Another application is using port 80. Answer: turn off Wi-Fi and disconnect all network cables, except one network cable from one of the LAN ports to the computer's wired Lan port. Than test with http:172.27.35.1. If this step fixes the problem, than you have go farther and isolate which device is using port 80. You do this by turning on one LAN device at a time and testing until http:172.27.35.1 won't work again. If this happens, the last device connected is the problem area.
The last thing you could do is update the router's firmware. If the router is using the latest firmware, reload the latest firmware again anyway.