How do I verify and deal with connectivity issues on my transit gateways?
Several issues exist that can cause problems when attempting to communicate between resources that are connected to your IBM Cloud® Transit Gateway.
You might receive error messages that state that you need to check whether the resource that you are requesting to access exists, and to review your network topology.
Known issues include incorrect permissions, overlapping VPC prefixes and classic infrastructure subnets, networking interface card routing, access control lists, firewalls and gateway appliances, and routing in classic virtual server instances.
To fix the connectivity issues you're encountering, review the following information topics: