When the NSX for vSphere (NSX-v) installations upgraded from 6.1.3 to 6.1.4, the existing NSX Edge Gateways cannot be deleted. This is a known issue that affects only upgrades from NSX-v 6.1.3 to NSX-v 6.1.4. Installations upgraded directly from 6.1.2 or earlier are not affected by this issue. Regardless of upgrade path, this issue does not affect new Edge Gateways created after the upgrade.