I have a strange problem with wifi on my n900 which is a little different from that described in this thread. While it detects a signal it is unable to connect. I get the error "Network connection error". I have a second N900 and it works fine using the same wifi. I compared the settings in settings > internet connections and they are identical. Later in the day I went to starbucks and I had no problem with wifi. Back home again and it doesn't work... Perhaps there are some other files I should compare settings? As I've been using it for several years, I wonder if some file got corrupted?

Thanks