Why won't my macbook air connect to the internet?

I recently arrived at my relatives house and connected to their guest internet via password. I opened network preferences, selected the network, and it connected. Then when I went to google chrome and safari, I was sent to a page where a login password was required. I entered this password and surfed the internet until mid day. Then this evening I went to log on to the internet and my macbook air wouldn't bring up the log in page like it had earlier this morning and yesterday evening. My iPod touch connects just fine, and so do the windows computers in the house. There is a three-device limit for the guest internet, but currently there is only one computer on it. I tried restarting my macbook several times, I deleted the account from the list of frequently accessed wifi spots, but nothing seems to work. Help please! And nothing too technical, I'm not really too computer savvy. Thanks.

I recently had a similar problem.  I tried many solutions that others propsed.
My particular solution, I "looked" into my Westell router and found its IP address. Seeing the other 5 devices (all were working on the internet), I saw how the ending number of the address identified the particular device on the router. I went to the System Preferences on the MacBook Air, opened up Network, chose Advanced and went to the tab TCP/IP and then in the Configure IPv4 address pull down used the manual DHCP and entered a new number that was 12 higher than another computer. 
Example 192.168.200.1 was router, another computer was 192.168.200.68 and I gave the Air .80 as the last number.  It worked!
I don't know what will happen when I return to my usual home network where it was working as well as on others.
Best of luck to all who have this problem.

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