I'm receiving the error "AES authentication failure".

The AES authentication error indicates that the network is potentially very lossy--lossy enough to fool the TCP checksum but not the more robust AES checksum performed by VNC Viewer.

One definite cause of this error is the Broadcom NetXtreme II gigabit NIC has a setting "Large Send Offload" enabled by default that causes this problem with VNC.

Please also ensure that you are running the latest release of VNC, as there was a bug relating to Single Sign-On/Encryption in E4.4.0/E4.4.1 that would cause this, which was fixed in E4.4.2.

http://www.realvnc.com/products/enterprise/4.4/release-notes.html

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