Sometimes, when I am in a public Wi-Fi an exclamation mark appears in the greyed out Wi-Fi icon.
I can connect to the Wi-Fi (I get assigned an IP address), but I cannot establish an internet connection - while other Mac users can. Every network where this has happened, I have been connected to before.
I've tried tried the following without success:
- run the troubleshoot assistant
- disconnect and reconnect from Wi-Fi
- disable and reenable Wi-Fi
- remove the network from the list of known networks
- restart the computer
Because none of my attempts to solve this problem yielded any positive results, I always end up not using the internet at all.
Now my sister has been calling me two times already, telling me that the same problem occurred to her. As I could not provide a fix, I need your help :)
My sister is running 10.7.3 on a Macbook 4.1. I am running 10.7.3 on a MBP 8.2.