Long version:
L:102 and L:104 - Launcher Failed to Connect to Shadow
If Shadow times out while trying to start your stream, the launcher displays one of the above error codes, indicating the launcher has failed to connect to your Shadow. These errors typically occur if:
Your Shadow is performing an update in the background, such as a Windows update. You'll need to wait for the update to complete before it will let you in.
Shadow is not able to start a video stream using your internet connection. The connection may be unstable or lower than Shadow's minimum requirements.
Solutions
Start with the first step below, proceeding through each step until the issue is resolved.
Try starting your Shadow again. It's possible your Shadow timed out on the first attempt but will connect on a second attempt.
Shut down your Shadow from the launcher before starting it again. To shut down Shadow from the launcher:
Click the Help icon, then click Shut Down Shadow.
Wait 2-3 minutes, then try to start Shadow again.
If Shadow still does not start, shut down Shadow and wait 10-15 minutes before starting Shadow again. This should be enough time to finish any pending updates.
Check if your internet connection is stable. Run a speed test following our article, Network Requirements and Optimization. If your test results show a high ping, an unstable download speed, or jitter, this may prevent you from establishing a stable connection to your Shadow.
Try connecting to Shadow on a different network or device. Connect to a different network (at a friend's place, work or school, or on a 5G/4G/LTE data network). If the issue persists, try using another computer or phone also compatible with Shadow. This will help determine if the issue is with your device, network connection, or your Shadow.
Try resetting your launcher settings. This is not the same as resetting your Shadow from your account page.