Bungie is actively tracking this general networking error. Your disconnect was reported the moment it occurred. If you continue to receive this error, please consider following the suggestions in our Network Troubleshooting Guide.
Before proceeding any further, we strongly recommend switching from WiFi to a wired connection, at least temporarily. This is an important first troubleshooting step to rule out WiFi signal strength/stability as a possible culprit.
If you are seeing this error paired with code CATERPILLAR, it may be an issue with your router's firewall settings blocking P2P connectivity. You may need to contact your internet service provider to help you determine if this is the case and to assist you in safely lowering your router's firewall settings.