Why did I suddenly lose my internet connection?

If you have noticed that your account suddenly shows a negative margin, it may be due to a temporary issue with risk-based margin calculations. Here is what you need to know:

1. Cause of the Issue:
   • The negative margin is typically caused by data processing problems in our system…

If market data is unavailable, you may see a red market data (DATA) icon on the upper right corner of TWS. This condition may be due to a firewall issue or to connectivity issue. You may use the keyboard shortcut CTRL+ALT+F to refresh the market data connections…

Sudden large increases in margin requirements can occasionally occur due to temporary issues with data processing. Here is what you need to know:

1. Cause of the Issue:
   • In rare cases, there can be problems with updated margin files received from clearing corporations…

TCP/IP is the basic protocol from an Internet service provider. This, along with DNS (Dynamic Name System) and basic socket access are all that is required for a "functioning Internet connection" and for running TWS software…