So when I tried to login to the game, I keep on getting the error message, "Login failed. Check your info." I've restarted my PC and tried again. Nothing happened. I reset my router, modemn, and PC once more. Nothing happened. I have then attempted everything that the Waframe support team suggested for me to do.

Here's the list:
Check if your router does not have its firewall active.
Add an exception in your firewall and antivirus to the Launcher.exe, Warframe.x64.exe and Warframe.exe.
Check your proxy settings by going to Windows control panel and searching for Internet options and then on the Connections tab > LAN settings and make sure use automatic configuration script and proxy server are Unchecked.
Optionally, you could go to the Advanced tab while in Internet options and click "Restore Advanced Settings" and "Reset" -- you will have to reboot again if you choose this option.
Make sure to disable any VPN or Proxy software.

I tried logging in again, and guess what message I see? "Login failed. Check your info."

HOW TO FIX:
They told me to go to:
http://www.spotflux.com/

Download the free version and wait for it to completely activate after the download is complete. It'll use web-encryption to prevent your internet service provider from affiliating itself with Warframe, which seems to be what's blocking you from logging in. Note that you do not need to create an account in order for this program to work.

After it's activated, launch the game as usual and try to login. You should be able to, but the only minor annoyance is having to use Spotflux whenever you want to play Warframe. Shouldn't be too big of a deal, though.

Also, once you've activated it, don't worry about the premium subscription running out. What's only important is the web-encryption. Have fun playing Warframe!