Code Centipede: this is a network issue, therefore, contact your network administrator or a network or internet technician.
Code Chicken: no solution yet for this issue.
Code Bee: The issue is having a stable connection from your network and the Bungie's server. If the issue is within the Bungie's server, let them fix it. If it's your network, try restarting your WiFi.
Code Lion and Fly: Same with the code Bee
Code Cattle: You are logged off. Just sign in back.