The game does not let most players enter, only a small minority can enter and play and strangely matches the tournament of champions, strange coincidence... And that you just did maintenance
We're currently looking into this. I let you know as soon as I have an update.
Currently, if you are playing while on a data connection please connect to WiFi if possible, as this may allow you to log in.
In case you haven't figured it out, EA doesn't know what they are doing. They ruined Madden this year and have ruined Iron Force. I guess in their money grab, they hire inept coders and buy 3rd rate servers. But they don't care because morons still spend money on their games. They are laughing (at you!) all the way to the bank.