If you see a "login attempts" error message, then most probably the necessary ports on your firewall are not yet configured to allow the TWS to connect.
In order to test whether your firewall needs any special setup or has been configured properly, please follow the instructions on this FAQ.
Should you still be unable to login after you have verified that port 4000 and port 4001 are open for the mentioned host, please contact us by phone at any Client Services phone numbers so we can assist you in real time or you login to your Client Portal and open a live chat with us.