Specifies the security mode of the communication channel used for XA calls between servers that participate in a global transaction. All server instances in a domain must have the same security mode setting. Security Interoperability Mode options: default The transaction coordinator makes calls using the kernel identity over an admin channel if it is enabled, and anonymous otherwise. Man-in-the-middle attacks are possible if the admin channel is not enabled. performance The transaction coordinator makes calls using anonymous at all times. This implies a security risk since a malicious third party could then try to affect the outcome of transactions using a man-in-the-middle attack. compatibility The transaction coordinator makes calls as the kernel identity over an insecure channel. This is a high security risk because a successful man-in-the-middle attack would allow the attacker to gain administrative control over both domains. This setting should only be used when strong network security is in place.