Following WolfVision Visualizers do not support Auto MDI/MDI-X:
VZ-9
VZ-9plus with serial number lower than 108068
VZ-C11
VZ-C12
VZ-C12² with serial number lower than 1009412
VZ-C30
VZ-C32 with serial number lower than 1011797
VZ-27plus
VZ-27plus²
VZ-57plus
A crossed Ethernet cable has to be used for direct connection.