Network Error: 00001003 - Xbox
There are multiple reasons what causes timeouts or difficulties with connecting to the game with error 00001003. In order to eliminate the most common causes of such situations, please follow the steps below:
Reset your router according to manufacturer's instructions.
Check different internet connections. In general it's advised to use ethernet cable, but for testing purposes you may try the wi-fi or a mobile hotspot from your phone.
Power cycle your console: https://support.xbox.com/en-US/help/hardware-network/power/restart-or-power-cycle-console
If you use, IPv6, try to disable it (it needs to be done on the computer). If you don't feel confident with changing that setting or you'll experience any difficulties with it you can contact your internet provider for additional advice.
We hope that the above steps will resolve the situation and restore the full joy of playing Green Hell with friends.