So today I had access to one of my ISP wifi hotspots and tried the command :

but without any success... the message still pops-up with the "Done" button.

So I was thinking that maybe I had to get the certificate on the N900, and I was asking myself how to do that. From what I got to read on the web about the way EAP-PEAP/EAP-GTC is working and guessing that my ISP is using RADIUS to authenticate the users, am I right by telling that the certificate in question is on the RADIUS server, as the encryption should be between my N900 and that server?
Could I use wireshark to get more info about this during the connection to the access point? (I don't know if wireshark exists on the N900). Are there any other methods for me to find the server and the address where I could get that certificate?

Oh, and my ISP won't give me more info, as for them it is working (I can connect and I have access to the Internet), so it's my problem if I have a pop-up on the N900.