Are you using virtualization software, such as VMware, Parallels or VirtualBox? These software products create network interfaces for their internal networking needs, and sometimes the network addresses they choose happen to conflict with the remote network of a VPN connection. Even if you are not currently using this software (but have it installed or not completely uninstalled) their network interfaces exist and can cause conflicts.
To find out which network interface is causing the conflict:
This is the network interface that is causing the problem. On most Macs, “en0” will correspond to the Ethernet interface and “en1” to the AirPort interface. Any other enX interfaces are either from virtualization software, or from additional network hardware (e.g. USB network adapters/modems). Network interfaces whose names start with “vboxnet” generally belong to VirtualBox and network interfaces starting with “vmnet” to VMware.
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